Researchers Database

YOSHIOKA Hideo

FacultyFaculty Division of Natural Sciences Research Group of Physics
PositionProfessor
Last Updated :2022/10/06

researchmap

Profile and Settings

  • Name (Japanese)

    Yoshioka
  • Name (Kana)

    Hideo

Degree

  • Doctor of Science, The University of Tokyo

Research Areas

  • Natural sciences, Magnetism, superconductivity, and strongly correlated systems
  • Natural sciences, Semiconductors, optical and atomic physics

Education

  • 1993, The University of Tokyo, 理学系研究科, 物理学, Japan
  • 1993, The University of Tokyo, Graduate School, Division of Science
  • 1988, Nagoya University, School of Science, 物理, Japan
  • 1988, Nagoya University, Faculty of Science

Association Memberships

  • 日本物理学会

Ⅱ.研究活動実績

Published Papers

  • Refereed, Journal of the Physical Society of Japan, Transport Properties of Zigzag Ribbons Composed of Two-Dimensional Quantum Spin Hall Insulators with a Single Magnetic Impurity, Tomoko Tatsumi; Hideo Yoshioka; Masahiko Hayashi, Apr. 2020, 89, 4, 043702, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Phase Competition, Solitons, and Domain Walls in Neutral-Ionic Transition Systems, Masahisa Tsuchiizu; Hideo Yoshioka; Hitoshi Seo, Phase competition and excitations in the one-dimensional neutral-ionic transition systems are theoretically studied comprehensively. From the semiclassical treatment of the bosonized Hamiltonian, we examine the competition among the neutral (N), ferroelectric-ionic (I-ferro), and paraelectric-ionic (I-para) states. The phase transitions between them can become first-order when the fluctuation-induced higher-order commensurability potential is considered. In particular, the description of the first-order phase boundary between N and Iferro enables us to analyze N-I-ferro domain walls. Soliton excitations in the three phases are described explicitly and their formation energies are evaluated across the phase boundaries. The characters of the soliton and domain-wall excitations are classified in terms of the topological charge and spin. The relevance to the experimental observations in the molecular neutral-ionic transition systems is discussed. We ascribe the pressure-induced crossover in tetrathiafulvalene-p-chloranil (TTF-CA) at a high-temperature region to that from the N to the I-para state, and discuss its consequence., Oct. 2016, 85, 10, 104705, Scientific journal
  • Not Refereed, PHYSICAL REVIEW B, AMER PHYSICAL SOC, Tomonaga-Luttinger liquid theory for metallic fullurene polymers, Hideo Yoshioka; Hiroyuki Shima; Yusuke Noda; Shota Ono; Kaoru Ohno, We investigate the low energy behavior of local density of states in metallic C-60 polymers theoretically. The multichannel bosonization method is applied to electronic band structures evaluated from first-principles calculation, by which the effects of electronic correlation and nanoscale corrugation in the atomic configuration are fully taken into account. We obtain a closed-form expression for the power-law anomalies in the local density of states, which successfully describes the experimental observation on the C-60 polymers in a quantitative manner. An important implication from the closed- form solution is the existence of an experimentally unobserved crossover at nearly a hundred milli-electron volts, beyond which the power-law exponent of the C-60 polymers should change significantly., Apr. 2016, 93, 16, 165431, Scientific journal
  • Not Refereed, 日本物理学会講演概要集 第70巻 第2号 2015年秋季大会, The Physical Society of Japan (JPS), 16aAG-13 Development of method for introducing lattice strain to graphene on BN, 友利ひかり; 平出璃音可; 大塚洋一; 林正彦; 吉岡英生; 渡辺賢司; 谷口尚; 神田,晶申, Sep. 2015, 70, 2, 1019, 1019, Symposium
  • Not Refereed, Journal of the Korean Physical Society, Enhancement of charge ordering by the zeeman effect in one-dimensional molecular conductors, Hideo Yoshioka; Hitoshi Seo; Yuichi Otsuka, The effects of an external magnetic field on the charge-ordered state are investigated within the one-dimensional extended Hubbard model with a quarter-filled band. We find that the external magnetic field leads to a coexistent state with three order parameters, i.e., the charge ordering, the uniform, and the staggered magnetic moments. In addition, the amplitude of the charge ordering is shown to be enhanced by the magnetic field. © 2013 The Korean Physical Society., Aug. 2013, 63, 3, 383, 386, Scientific journal
  • Not Refereed, CRYSTALS, MDPI AG, Theoretical Studies on Phase Transitions in Quasi-One-Dimensional Molecular Conductors, Hideo Yoshioka; Yuichi Otsuka; Hitoshi Seo, A review is given for recent theoretical studies on phase transitions in quasi-one-dimensional molecular conductors with a quarter-filled band. By lowering temperature, charge transfer salts exhibit a variety of transitions accompanying symmetry breaking, such as charge ordering, lattice dimerization, antiferromagnetic transition, spin-Peierls distortion, and so on. Analyses on microscopic quasi-one-dimensional models provide their systematic understandings, by the complementary use of different analytical and numerical techniques; they can reproduce finite-temperature phase transitions, whose results can be directly compared with experiments and give feedbacks to material design., Sep. 2012, 2, 3, 996, 1016
  • Not Refereed, EPL, EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY, Observation of Riemannian geometric effects on electronic states, Jun Onoe; Takahiro Ito; Hiroyuki Shima; Hideo Yoshioka; Shin-ichi Kimura, Einstein first applied Riemannian geometry to develop the general theory of relativity almost one hundred years ago and succeeded in understanding astronomical-scale phenomena such as the straining of time-space by a gravitational field. Whether or not Riemannian space affects the electronic properties of condensed matters on a much smaller scale is of great interest. Although Riemannian geometry has been applied to quantum mechanics since the 1950s, nobody has yet answered this question, because the electronic properties of materials with Riemannian geometry have not been examined experimentally. We report here the first observation of Riemannian geometrical effects on the electronic properties of materials such as Tomononaga-Luttinger liquids, which were previously theoretically predicted by our group. We present in situ high-resolution ultraviolet photoemission spectra of a one-dimensional metallic C-60 polymer with an uneven periodic peanut-shaped structure. Copyright (C) EPLA, 2012, Apr. 2012, 98, 2, 27001, Scientific journal
  • Not Refereed, Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), Formation of graphene with one dimensional local strain and transport measurement, Tomori,H; Goto,H; Toyota,Y; Nukui,Y; Karube,H; Nihei,S; Ootuka,Y; Tsukagoshi,K; Hayashi,M; Yoshioka,H; Kanda,A, Mar. 2012, 67, 1, 885, Scientific journal
  • Refereed, Fullerene, Nanotubes, and Carbon Nanostructures, One-dimensional uneven peanut-shaped C60 polymer: a quantum electronic system on Riemannian space, J. Onoe; T. Ito; S. Kimura; H. Shima; Y. Toda; H. Yoshioka, 2012, 20, 1, 1-16, Scientific journal
  • Not Refereed, FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES, TAYLOR & FRANCIS INC, One-Dimensional Uneven Peanut-Shaped C-60 Polymer: A Quantum Electronic System in Riemannian Space, Jun Onoe; Takahiro Ito; Shin-Ichi Kimura; Hiroyuki Shima; Yasuhiro Toda; Hideo Yoshioka, When a C-60 film is irradiated with a 3 kV electron-beam in an ultrahigh vacuum (base pressure: 10(-7) Pa), C-60 molecules are coalesced to form a one-dimensional (1D) uneven peanut-shaped C-60 polymer. From a topological viewpoint, since the polymer has both positive and negative Gaussian curvatures, it can be regarded as a new allotrope of nanocarbons different from graphene, fullerenes, and nanotubes. We will present our recent results of the electronic, optical, and electron-transport properties of the 1D uneven peanut-shaped C-60 polymer and discuss its novel electronic properties on the basis of quantum mechanics in Riemannian space., 2012, 20, 1, 1, 16, Scientific journal
  • Not Refereed, 26TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT26), PTS 1-5, IOP PUBLISHING LTD, Collapse of Charge Ordering Due to Disorder in Quasi One-Dimensional Electron Systems, Hideo Yoshioka, Effects of disorder on charge ordering ( CO) is investigated for one-dimensional (1D) and quasi 1D extended Hubbard model with infinite on-site repulsion at quarter filling. Only the forward scattering due to disorder is taken into account. In the 1D model, the resistivity due to Umklapp scattering that is an origin of CO is shown to be suppressed by the forward scattering. In addition, we obtain that the CO transition temperature T-CO for quasi 1D model becomes smaller with increasing strength of the forward scattering., 2012, 400, 032125, International conference proceedings
  • Not Refereed, 26TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT26), PTS 1-5, IOP PUBLISHING LTD, Supercurrent through Graphene: Effects of Vanishing Density of States, M. Hayashi; H. Yoshioka; A. Kanda, The critical current through superconductor-graphene-superconductor Josephson junction has been studied theoretically in terms of tunnel Hamiltonian approximation. In this paper we especially focus on the effects of vanishing density of state at Fermi level in monolayer graphene. We discuss a characteristic suppression of critical current at low temperature., 2012, 400, 022024, International conference proceedings
  • Not Refereed, 26TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT26), PTS 1-5, IOP PUBLISHING LTD, Effects of Hopping Modulation at the Edges on Transport Properties of Zigzag Graphene Nanoribbon Attached to Two Normal Metals, Hideo Yoshioka; Yoneko Mochizuki, Transport properties of the junction composed of graphene nanoribbon with zigzag shaped edges attached to two normal metals are theoretically investigated. In order to clarify roles of zigzag edges on the transport properties, we consider the system where the hopping at the zigzag edges are weaker than the other bond. The results are compared with the case without modulation studied previously., 2012, 400, 042077, International conference proceedings
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Incommensurate Antiferromagnetic Insulating State in (MDT-TS)(AuI2)(x), Hideo Yoshioka; Hitoshi Seo; Yuichi Otsuka, We theoretically study the metal-insulator transition in a molecular conductor (MDT-TS)(AuI2)(x) composed with an incommensurate ratio (x = 0.441), where the conduction band originated from the HOMO of donor MDT-TS molecules is incommensurately filled. We consider a two-dimensional Hubbard model taking account of anisotropic transfer integrals in the donor layer, under a periodic potential due to the anions (AuI2)(-) which mismatches the donor lattice period, and investigate the ground state within mean-field approximation. An antiferromagnetic insulating state with induced charge disproportionation is obtained in the large U and delta region; the symmetry in the charge sector is unchanged from the paramagnetic metallic state realized at small U and delta, therefore this state corresponds to the incommensurate Mott insulating state predicted previously [H. Yoshioka et al.: J. Phys. Soc. Jpn. 74 (2005) 1922] based on a simplified one-dimensional model., Dec. 2011, 80, 12, 123702, Scientific journal
  • Not Refereed, CHEMICAL PHYSICS LETTERS, ELSEVIER SCIENCE BV, Electronic spectral shift of oxygen-filled (6,6) carbon nanotubes, Hiroyuki Shima; Hideo Yoshioka, Electronic state modulation of armchair (6,6) carbon nanotubes filled with a linear assembly of oxygen molecules is addressed theoretically. Ferromagnetic ordering of encapsulated oxygen produces a magnetic field with cylindrical symmetry, which deviates the electron's eigenenergies from those prior to the oxygen absorption. An intriguing spectral gap arises near the Fermi energy, at which the gap formation is allowed only when the tube length equals to a multiple of three in units of carbon hexagon. A possible means to detect the selective gap formation is discussed. (C) 2011 Elsevier B.V. All rights reserved., Sep. 2011, 513, 4-6, 224, 228, Scientific journal
  • Not Refereed, PHYSICAL REVIEW B, AMER PHYSICAL SOC, Density of states anomalies in multichannel quantum wires, Hideo Yoshioka; Hiroyuki Shima, We reformulate the Tomonaga-Luttinger liquid theory for quasi-one-dimensional Fermion systems with many subbands across the Fermi energy. Our theory enables us to obtain a rigorous expression of the local density of states (LDOS) for general multichannel quantum wires, describing how the power-law anomalies of the LDOS depend on inter- and intra-subbands couplings as well as the Fermi velocity of each band. The resulting formula for the exponents is valid in the cases of both bulk contact and edge contact, and thus plays a fundamental role in the physical properties of multicomponent Tomonaga-Luttinger liquid systems., Aug. 2011, 84, 7, 075443, Scientific journal
  • Not Refereed, EUROPEAN PHYSICAL JOURNAL B, SPRINGER, Manipulating the Tomonaga-Luttinger exponent by electric field modulation, H. Shima; S. Ono; H. Yoshioka, We establish a theoretical framework for artificial control of the power-law singularities in Tomonaga-Luttinger liquid states. The exponent governing the power-law behaviors is found to increase significantly with an increase in the amplitude of spatially periodic electrostatic field applied to the system. This field-induced shift in the exponent indicates the tunability of the transport properties of quasi-one-dimensional electron systems., Dec. 2010, 78, 4, 481, 488, Scientific journal
  • Not Refereed, PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, ELSEVIER SCIENCE BV, Theoretical study of superconducting proximity effect in single and multi-layered graphene, Masahiko Hayashi; Hideo Yoshioka; Akinobu Kanda, Theoretical analysis of superconducting current in graphite thin films (or graphene) in proximity to superconductors is presented, especially paying attention to the band structure. We derive the general formula to calculate the free energy of the superconductor-graphite film-superconductor junction, which enable us to calculate the critical current of the junction. We introduce two models for the band structures: (1) Fermi point type (characteristic to monolayer case) and (2) zero-gap semiconductor type (characteristic to bilayer case). Then we calculate the superconducting critical current as a function of junction length and temperature. (C) 2009 Published by Elsevier B.V., Dec. 2010, 470, S846, S847, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Finite-Temperature Properties across the Charge Ordering Transition-Combined Bosonization, Renormalization Group, and Numerical Methods-, Hideo Yoshioka; Masahisa Tsuchiizu; Yuichi Otsuka; Hitoshi Seo, We theoretically describe the charge ordering (CO) metal-insulator transition based on a quasi-one-dimensional extended Hubbard model, and investigate the finite temperature (T) properties across the transition temperature, T-CO. In order to calculate T dependence of physical quantities such as the spin susceptibility and the electrical resistivity, both above and below T-CO, a theoretical scheme is developed which combines analytical methods with numerical calculations. We take advantage of the renormalization group equations derived from the effective bosonized Hamiltonian, where Lanczos exact diagonalization data are chosen as initial parameters, while the CO order parameter at finite-T is determined by quantum Monte Carlo simulations. The results show that the spin susceptibility does not show a steep singularity at T-CO, and it slightly increases compared to the case without CO because of the suppression of the spin velocity. In contrast, the resistivity exhibits a sudden increase at T-CO, below which a characteristic T dependence is observed. We also compare our results with experiments on molecular conductors as well as transition metal oxides showing CO., Sep. 2010, 79, 9, 094714, Scientific journal
  • Not Refereed, Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 23pXB-2 Theory of Superconducting Proximity Effect in Graphene II, Hayashi,M; Kanda,A; Yoshioka,H, Aug. 2010, 65, 2, 743, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Anomalous Interaction Dependence in Magnetism of Graphene Nanoribbons with Zigzag Edges, Karin Furukawa; Hideo Yoshioka; Yoneko Mochizuki, The properties in magnetic ordered states of graphene nanoribbons with zigzag-shaped edges are investigated by applying mean-field approximation to the Hubbard model with the on-site repulsion U. We observe that magnetic moments and critical temperature show anomalous power-law dependences as a function of U; the actual values of the power are determined by only the width of the ribbons. Such singular behaviours are found to be due to the localized nature of the electronic states close to the Fermi energy., Aug. 2010, 79, 8, 084708, Scientific journal
  • Not Refereed, Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 21aGS-5 Superconducting proximity effect in few-layer graphene, Kanda,A; Goto,H; Tomori,H; Tanaka,S; Ootuka,Y; Tsukagoshi,K; Hayashi,M; Yoshioka,H, Mar. 2010, 65, 1, 872, 872, Scientific journal
  • Not Refereed, PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, ELSEVIER SCIENCE BV, Transport properties of normal metal-graphene nanoribbon-normal metal junctions, Yoneko Mochizuki; Hideo Yoshioka, Transport properties are investigated theoretically for the junctions consisting of two normal metals and a graphene nanoribbon which has zigzag shaped edges with the electron hopping weaker than that in the other region. We find that the conductance of the present model has the same asymptotic behavior for N(L) >> 1 as that with the spatially uniform hopping in the N(L) >= 3 case, where N(L) and N are integers corresponding to length and width, respectively. The result seems to indicate that the zigzag edges do not contribute to the transport properties in the case with N(L) >> 1. (C) 2009 Elsevier B.V. All rights reserved., Feb. 2010, 42, 4, 722, 725, Scientific journal
  • Not Refereed, PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, ELSEVIER SCIENCE BV, Curvature effects on collective excitations in dumbbell-shaped hollow nanotubes, Hiroyuki Shima; Hideo Yoshioka; Jun Onoe, We investigate surface-curvature induced alteration in the Tomonaga-Luttinger liquid (TLL) states of a one-dimensional (1D) deformed hollow nanotube with a dumbbell-shape. Periodic variation of the surface curvature along the axial direction is found to enhance the TLL exponent significantly, which is attributed to an effective potential field that acts low-energy electrons moving on the curved surface. The present results accounts for the experimental observation of the TLL properties of 1D metallic peanut-shaped fullerene polymers whose enveloping surface is assumed to be a dumbbell-shaped hollow tube. (c) 2009 Elsevier B.V. All rights reserved., Feb. 2010, 42, 4, 1151, 1154, Scientific journal
  • Not Refereed, INTERNATIONAL CONFERENCE ON THEORETICAL PHYSICS DUBNA-NANO 2010, IOP PUBLISHING LTD, Superconducting proximity effect in graphene nanostructures, M. Hayashi; H. Yoshioka; A. Kanda, The superconducting proximity effect is studied theoretically for graphene(G)-superconductor(S) hybrid structures. Especially S-G-S junction is considered and the critical current is argued focusing on its temperature and junction-length dependences. The free energy of the total system is calculated by use of the tunneling approximation and the critical current is estimated from it. It is reported that the critical current can oscillate as a function of temperature and junction-length in bi-layer junctions. Some detailed comparison with ordinary S-normal metal-S junctions is also given and both monolayer and bilayer junctions show some characteristic deviations., 2010, 248, 012002, International conference proceedings
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Theoretical Study on Transport Properties of Normal Metal-Zigzag Graphene Nanoribbon-Normal Metal Junctions, Yoneko Mochizuki; Hideo Yoshioka, We investigate transport properties of the junctions in which the graphene nanoribbon with the zigzag shaped edges consisting of the N legs is sandwiched by the two normal metals by means of recursive Green's function method. The conductance and the transmission probabilities are found to have the remarkable properties depending on the parity of N. The singular behaviors close to E = 0 with E being the Fermi energy are demonstrated. The channel filtering is shown to occur in the case with N = even., Dec. 2009, 78, 12, 123701, Scientific journal
  • Not Refereed, Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 26pYE-9 Anomalous behavior of proximity-induced superconducting transition in multilayer graphene under gate-electric field, Kanda,A; Hayashi,M; Yoshioka,H; Goto,H; Tomori,H; Tanaka,S; Ootuka,Y; Tsukagoshi,K, Aug. 2009, 64, 2, 765, Scientific journal
  • Refereed, Physical Review B - Condensed Matter and Materials Physics, Geometry-driven shift in the Tomonaga-Luttinger exponent of deformed cylinders, Hiroyuki Shima; Hideo Yoshioka; Jun Onoe, We demonstrate the effects of geometric perturbation on the Tomonaga-Luttinger liquid (TLL) states in a long, thin, and hollow cylinder whose radius varies periodically. The variation in the surface curvature inherent to the system gives rise to a significant increase in the power-law exponent of the single- particle density of states. The increase in the TLL exponent is caused by a curvature-induced potential that attracts low-energy electrons to region that has large curvature. © 2009 The American Physical Society., 01 May 2009, 79, 20, Scientific journal
  • Not Refereed, PHYSICAL REVIEW B, AMER PHYSICAL SOC, Geometry-driven shift in the Tomonaga-Luttinger exponent of deformed cylinders, Hiroyuki Shima; Hideo Yoshioka; Jun Onoe, We demonstrate the effects of geometric perturbation on the Tomonaga-Luttinger liquid (TLL) states in a long, thin, and hollow cylinder whose radius varies periodically. The variation in the surface curvature inherent to the system gives rise to a significant increase in the power-law exponent of the single- particle density of states. The increase in the TLL exponent is caused by a curvature-induced potential that attracts low-energy electrons to region that has large curvature., May 2009, 79, 20, 201401, Scientific journal
  • Not Refereed, 25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 2, IOP PUBLISHING LTD, Properties of nano-graphite ribbons with zigzag edges - Difference between odd and even legs, H. Yoshioka; S. Higashibata, Persistent currents and transport properties are investigated for the nano-graphite ribbons with zigzag shaped edges with paying attention to system length L dependence. It is found that both the persistent current in the isolated ring and the conductance of the system connected to the perfect leads show the remarkable L dependences. In addition, the dependences for the systems with odd legs and those with even legs are different from each other. On the persistent current, the amplitude for the cases with odd legs shows power-low behavior as L(-N) with N being the number of legs, whereas the maximum of it decreases exponentially for the cases with even legs. The conductance per one spin normalized by e(2)/h behaves as follows. In the even legs cases, it decays as L(-2), whereas it reaches to unity for L -> infinity in the odd legs cases. Thus, the material is shown to have a remarkable property that there is the qualitative difference between the systems with odd legs and those with even legs even in the absence of the electron-electron interaction., 2009, 150, 022105, International conference proceedings
  • Refereed, Bussei Kenkyu, Bussei Kenkyu, グラフェンにおける超伝導近接効果の理論(不均一超伝導超流動状態と量子物理,研究会報告), 林, 正彦; 吉岡, 英生; 神田, 晶申, Dec. 2008, 91, 3, 241, 241, Scientific journal
  • Not Refereed, INTERNATIONAL SYMPOSIUM ON ADVANCED NANODEVICES AND NANOTECHNOLOGY, IOP PUBLISHING LTD, Superconducting proximity effect through graphene and graphite films, Masahiko Hayashi; Hideo Yoshioka; Akinobu Kanda, We discuss the superconducting proximity effect in graphite films (or graphene) by studying the critical current through superconductor-graphite film (or graphene)superconductor Josephson junction. The two leads are assumed to be conventional s-wave superconductors. We especially pay attention to the dispersions of electrons in graphite films: because of the delicate band structure of graphite, the electron dispersion in the film, which undergoes the effects of various external factors such as leads, gate electrodes and sample inhomogeneities, can show a wide variety. We introduce several models for electron dispersion near Fermi energy: 1) graphene-like Fermi points, 2) semi-metal, and 3) semiconducting gap. The superconducting critical current I, through the junction is usually expressed as I-c proportional to exp{-d/xi(T)}, where d is the distance between two leads and xi(T) is the proximity length. We show that the temperature dependence of (T) is largely affected by the band structure of the graphite film and by examining this dependence some insight into the electronic properties of the graphite film can be obtained., 2008, 109, 012014, International conference proceedings
  • Not Refereed, Journal of Physics: Conference Series, Mott insulating state in incommensurate molecular conductors, YOSHIOKA Hideo; Hitoshi Seo; Hideo Yoshioka; Yuichi Otsuka, 2008, 132, 012018
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Charge-ordered state versus Dimer-Mott insulator at finite temperatures, Hideo Yoshioka; Masahisa Tsuchiizu; Hitoshi Seo, We theoretically investigate the competition between charge-ordered state and Mott insulating state at finite temperatures in quarter-filled quasi-one-dimensional electron systems, by studying dimerized extended Hubbard chains with interchain Coulomb interactions. In order to take into account onedimensional fluctuations properly, we apply the bosonization method to an effective model obtained by the interchain mean-field approximation. The results show that lattice dimerization, especially in the critical region, and frustration in the interchain Coulomb interactions reduce the charge-ordering phase transition temperature and enlarge the dimer-Mott insulating phase. We also derive a general formula of the Knight shift in the charge-ordered phase and its implication to experiments is discussed., Oct. 2007, 76, 10, 103701, Scientific journal
  • Not Refereed, JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, ELSEVIER SCIENCE BV, Knight shift in the charge ordered states of the one-dimensional electron systems at 1/4 filling, Hideo Yoshioka; Rie Tsutsumi, Knight shift in the pure charge ordered states is calculated for the one-dimensional extended Hubbard model at quarter filling. The cases of charge ordered state with a 2-fold periodicity and with a 4-fold one are investigated based on the mean-field theory. It is shown that splitting of the Knight shift observed below the transition temperature reflects not the periodicity enlarged by the charge ordering but the charge disproportionation. (c) 2006 Elsevier B.V. All rights reserved., Mar. 2007, 310, 2, E332, E334, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Finite-temperature charge-ordering transition and fluctuation effects in quasi one-dimensional electron systems at quarter filling, Hideo Yoshioka; Masahisa Tsuchiizu; Hitoshi Seo, Finite-temperature charge-ordering phase transition in quasi one-dimensional (ID) molecular conductors is investigated theoretically, based on a quasi I D extended Hubbard model at quarter filling with interchain Coulomb repulsion V-perpendicular to. The interchain term is treated within a mean-field approximation, and the ID fluctuations in the chains are fully taken into account by the bosonization theory. Three regions are found depending on the appearance of the charge-ordered state at a finite temperature when V-perpendicular to is introduced: (i) a weak-coupling region where the system transforms from a metal to a charge-ordered insulator with a finite transition temperature at a finite critical value of V-perpendicular to, (ii) an intermediate region where this transition occurs by infinitesimal V-perpendicular to due to the stability of the inherent ID fluctuation, and (iii) a strong-coupling region where the charge ordered state is already realized in a purely 1D case, of which the transition temperature becomes finite with infinitesimal V-perpendicular to. An analytical formula for the V-perpendicular to dependence of the transition temperature is derived for each region., Jun. 2006, 75, 6, 063706, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Theoretical aspects of charge ordering in molecular conductors, Hitoshi Seo; Jaime Merino; Hideo Yoshioka; Masao Ogata, Theoretical studies on charge ordering phenomena in quarter-filled molecular (organic) conductors are reviewed. Extended Hubbard models including not only the on-site but also the inter-site Coulomb repulsion are constructed in a straightforward way from the crystal structures, which serve for individual study on each material as well as for their systematic understandings. In general the inter-site Coulomb interaction stabilizes Wigner crystal-type charge ordered states, where the charge localizes in an arranged manner avoiding each other, and can drive the system insulating. The variety in the lattice structures, represented by anisotropic networks in not only the electron hopping but also in the inter-site Coulomb repulsion, brings about diverse problems in low-dimensional strongly correlated systems. Competitions and/or co-existences between the charge ordered state and other states are discussed, such as metal, superconductor, and the dimer-type Mott insulating state which is another typical insulating state in molecular conductors. Interplay with magnetism, e.g., antiferromagnetic state and spin gapped state is considered as well. Distinct situations are pointed out: influences of the coupling to the lattice degree of freedom and effects of geometrical frustration which exists in many molecular crystals. Some related topics, such as charge order in transition metal oxides and its role in new molecular conductors, are briefly remarked., May 2006, 75, 5, 051009
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Knight shift and nuclear spin relaxation rate in a charge-ordered state of the one-dimensional extended Hubbard model at quarter filling, H Yoshioka, We investigate Knight shift and nuclear spin relaxation rate in a charge-ordered state of the one-dimensional extended Hubbard model with a quarter-filled band by using RPA around the mean-field solution. It is shown that both quantities show splitting below the critical temperature of the charge order, as is experimentally observed. The relationships between the amount of the splitting in the both quantities and the charge disproportionation rate are discussed., Mar. 2006, 75, 3, 034703, Scientific journal
  • Not Refereed, JOURNAL OF LOW TEMPERATURE PHYSICS, SPRINGER/PLENUM PUBLISHERS, Theoretical study on knight shift and nuclear spin relaxation rate in the charge ordering state of the ID quarter-filled electron system, Hideo Yoshioka, We study theoretically the Knight shift and the nuclear spin relaxation rate in the charge ordering (CO) state of the one-dimensional extended Hubbard model with a quarter-filled band. It is shown that the both quantities split into the two components below the critical temperature of CO, which is different from the half-filled case. The relationship between the amount of splitting in these quantities and the charge disproportionation rate is discussed., Feb. 2006, 142, 3-4, 503, 506, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Incommensurate Mott insulator in one-dimensional electron systems close to quarter filling, H Yoshioka; H Seo; H Fukuyama, The possibility of metal-insulator transition in molecular conductors has been studied for systems composed of donor molecules and fully ionized anions with an incommensurate ratio close to 2 : I based on the one-dimensional extended Hubbard model, where donor carriers are slightly deviated from quarter filling and under an incommensurate periodic potential from anions. By the renormalization group method, the interplay between commensurability energy on the donor lattice and that from the anion potential has been studied and it has been found that an "incommensurate Mott insulator" can be generated. This theoretical finding will qualitatively explain the appearance of the insulating state in a two-dimensional material with an incommensurate, Jul. 2005, 74, 7, 1922, 1925, Scientific journal
  • Not Refereed, PHYSICA B-CONDENSED MATTER, ELSEVIER SCIENCE BV, Photoemission spectroscopy on single-wall carbon nanotubes, H Shiozawa; H Ishii; H Kataura; H Yoshioka; H Kihara; Y Takayama; T Miyahara; S Suzuki; Y Achiba; T Kodama; M Nakatake; T Narimura; M Higashiguchi; K Shimada; H Namatame; M Taniguchi, One-dimensional nature of single-wall carbon nanotubes (SWNTs) has been investigated by the photoemission spectroscopy on SWNT samples with different diameters. We successfully observe peak structures that arise from one-dimensional van Hove singularities. The spectral function and the intensity at the Fermi level both exhibit power-law behavior with almost identical exponents, which indicates that the metallic SWNTs are regarded as ideal one-dimensional systems. (C) 2004 Elsevier B.V. All rights reserved., Sep. 2004, 351, 3-4, 259, 261, Scientific journal
  • Not Refereed, JOURNAL DE PHYSIQUE IV, E D P SCIENCES, Charge ordering and Knight shift in one-dimensional electron systems nearly half-filling, H Yoshioka; Y Hashizume, We investigate Knight shift in the charge ordered state of the one-dimensional electron system nearly half-filling. It is shown that the splitting of Knight shift occurs below the critical temperature of charge ordering. This finding is different from the case of just half-filling, where the splitting does not occur even in the charge ordered state. In addition. we find the simple relations among the difference between the shift in the charge rich site and that in the poor site and the mount of the charge transfer., Apr. 2004, 114, 159, 161, Scientific journal
  • Refereed, ELECTRONIC PROPERTIES OF SYNTHETIC NANOSTRUCTURES, AMER INST PHYSICS, Electronic structure of single-wall carbon nanotubes and peapods; Photoemission study, H Kataura; H Shiozawa; S Suzuki; Y Achiba; M Nakatake; H Namatame; M Taniguchi; H Yoshioka; H Ishii, Electronic structure of single-wall carbon nanotubes was investigated by photoemission spectroscopy. Oscillations in electronic density of states due to one-dimensional van Hove singularities were clearly observed near the Fermi level, which can be well reproduced by simple tight-binding calculation with assumptions a broadening and an energy shift probably due to a charge transfer from the metal substrate. Furthermore, in the vicinity of the Fermi level, two kinds of typical power-law dependences were observed that can be regarded as evidence of Tomonaga-Luttinger liquid states. Both exponents show very similar values 0.46 and 0.48 good agreement with theoretical prediction. Results on fullerene peapod system are also discussed., 2004, 723, 222, 226, International conference proceedings
  • Not Refereed, NATURE, NATURE PUBLISHING GROUP, Direct observation of Tomonaga-Luttinger-liquid state in carbon nanotubes at low temperatures, H Ishii; H Kataura; H Shiozawa; H Yoshioka; H Otsubo; Y Takayama; T Miyahara; S Suzuki; Y Achiba; M Nakatake; T Narimura; M Higashiguchi; K Shimada; H Namatame; M Taniguchi, The electronic transport properties of conventional three-dimensional metals are successfully described by Fermi-liquid theory. But when the dimensionality of such a system is reduced to one, the Fermi-liquid state becomes unstable to Coulomb interactions, and the conduction electrons should instead behave according to Tomonaga-Luttinger-liquid (TLL) theory. Such a state reveals itself through interaction-dependent anomalous exponents in the correlation functions, density of states and momentum distribution of the electrons(1-3). Metallic single-walled carbon nanotubes (SWNTs) are considered to be ideal one-dimensional systems for realizing TLL states(4-6). Indeed, the results of transport measurements on metal - SWNT and SWNT - SWNT junctions have been attributed(7-9) to the effects of tunnelling into or between TLLs, although there remains some ambiguity in these interpretations(10). Direct observations of the electronic states in SWNTs are therefore needed to resolve these uncertainties. Here we report angle-integrated photoemission measurements of SWNTs. Our results reveal an oscillation in the pi-electron density of states owing to one-dimensional van Hove singularities, confirming the one-dimensional nature of the valence band. The spectral function and intensities at the Fermi level both exhibit power-law behaviour ( with almost identical exponents) in good agreement with theoretical predictions for the TLL state in SWNTs., Dec. 2003, 426, 6966, 540, 544, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Spin excitation in nano-graphite ribbons with zigzag edges, H Yoshioka, Spin excitation in a nano-graphite ribbon with zigzag edges is investigated theoretically. Due to the strongly localized nature of the states near the Fermi energy, the effective Hamiltonian for the low-energy physics is given by the Heisenberg Hamiltonian with the nearest neighbor exchange coupling. The action corresponding to the effective Hamiltonian is mapped to that of the O(3) nonlinear sigma model. It is shown that the spin excitation has a gap when the number of the zigzag lines is even, whereas the excitation becomes gapless in the case of an odd number of zigzag lines., Sep. 2003, 72, 9, 2145, 2148, Scientific journal
  • Not Refereed, PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, ELSEVIER SCIENCE BV, Tomonaga-Luttinger-liquid behavior in conducting carbon nanotubes with open ends, H Yoshioka, We discuss the local density of states (LDOS) of the semi-infinite conducting carbon nanombe based on the bosonization theory of one-dimensional electron systems with open boundaries. The dependences of the spatially slowly varying component of the LDOS on location, energy and temperature are investigated. (C) 2003 Elsevier Science B.V. All rights reserved., May 2003, 18, 1-3, 212, 213, Scientific journal
  • Not Refereed, SYNTHETIC METALS, ELSEVIER SCIENCE SA, Excitations in the charge ordered state of one-dimensional extended Hubbard model at half-filling, H Yoshioka; Y Hashizume, We investigate excitation spectra in the charge ordered state of the one-dimensional extended Hubbard model at half-filling with taking account of fluctuations around the mean-field solution. The imaginary parts of the dynamical susceptibilities, the dispersion relations and the weights of the collective modes are discussed., Apr. 2003, 135, 1-3, 551, 552, Scientific journal
  • Not Refereed, SYNTHETIC METALS, ELSEVIER SCIENCE SA, Commensurate-incommensurate transition in a one-dimensional dimerized electron system close to quarter-filling, H Yoshioka; M Tsuchiizu; Y Suzumura, We investigate electronic states upon doping (i.e., by varying the chemical potential) for a quarter-filled one-dimensional electron system with a dimerization, on-site and nearest-neighbor repulsive interaction. By applying the renormalization group method to the bosonized Hamiltonian, the metal-insulator transition followed by commensurate-incommensurate transition is obtained for Mott insulating region as well as charge ordered insulating regime. We discuss the phase diagram on the plane of the chemical potential and the interaction. (C) 2002 Elsevier Science B.V. All rights reserved., Mar. 2003, 133, 49, 50, Scientific journal
  • Not Refereed, MOLECULAR NANOSTRUCTURES, AMER INST PHYSICS, Valence-band photoemission study of single-wall carbon nanotubes, H Shiozawa; H Ishii; H Kataura; H Yoshioka; H Otsubo; Y Takayama; T Miyahara; S Suzuki; Y Achiba; T Kodama; M Nakatake; T Narimura; M Higashiguchi; K Shimada; H Namatame; M Taniguchi, We have performed the valence-band photoemission spectroscopy on single-wall carbon nanotubes. Characteristic peak structures originated from one-dimensional van Hove singularities have been successfully observed. The peak structures are well reproduced by the calculation based on the tight-binding model taking into account a diameter distribution of nanotubes., 2003, 685, 139, 142, International conference proceedings
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Tomonaga-Luttinger-liquid theory of metallic carbon nanotubes with open boundaries, H Yoshioka; Y Okamura, Tomonaga-Luttinger-liquid theory is formulated for metallic carbon nanotubes with open boundaries. Both cases of single- and multi-wall nanotubes are discussed. Based on this theory, spatial variation of the charge density from an edge is investigated with taking account of the shift of the chemical potential which expresses the carrier injection to the nanotube. The charge density has the spatially independent part and the oscillatory component. Roles of Coulomb interaction on the amplitude of the oscillation, the wavenumbers of it and the uniform component of the charge. density are clarified., Oct. 2002, 71, 10, 2512, 2519, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Magnetic fluctuations in a charge-ordered state of the one-dimensional extended Hubbard model with a half-filled band, H Yoshioka, Magnetic properties in a charge-ordered state are examined for the extended Hubbard model at half-filling. Magnetic excitations, magnetic susceptibilities and a nuclear spin relaxation rate are calculated with taking account of fluctuations around the mean-field solution. The relevance of the present results to the observation in the 1:1 organic conductors, (TTM-TTP)I-3, is discussed., Aug. 2002, 71, 8, 1812, 1815, Scientific journal
  • Not Refereed, JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, PERGAMON-ELSEVIER SCIENCE LTD, NMR relaxation rate in metallic carbon nanotubes, H Yoshioka, NMR relaxation rate, T-1(-1), of the metallic carbon nanotube is discussed based on Tomonaga-Luttinger-liquid theory. It is found that the Coulomb interaction leads to increase of (T1T)(-1) by a power law with decreasing temperature, T. The dependence on temperature of (T1T)(-1) in the multi-wall nanotube (MWNT) is shown to be strongly suppressed by existence of the metallic shells in the MWNTs. (C) 2002 Elsevier Science Ltd. All rights reserved., Jun. 2002, 63, 6-8, 1281, 1284, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Oscillator strength of metallic carbon nanotubes, H Yoshioka, Based on the tight binding method with a hopping integral between the nearest-neighbor atoms, an oscillator strength integral (infinity)(0) d omega Re sigma(omega) is discussed for armchair and metallic zigzag carbon nanotubes. The formulae of the oscillator strength are derived for both types of nanotubes and are compared with the result obtained by a linear chain model. In addition, the doping dependence is investigated in the absence of the Coulomb interaction. It is shown that the oscillator strength of each carbon nanotube shows qualitatively the same doping dependence, hut the fine structure is different due to its own peculiar band structure. Some relations independent of the radius of the tube are derived; and a useful formula for determining the amount of doping is proposed., Jan. 2001, 70, 1, 17, 20, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Effects of next-nearest-neighbor repulsion on one-dimensional quarter-filled electron systems, H Yoshioka; M Tsuchiizu; Y Suzumura, We examine effects of the next-nearest-neighbor repulsion on electronic states of a one-dimensional interacting electron system which consists of quarter-filled band and interactions of on-site and nearest-neighbor repulsion. We derive the effective Hamiltonian for the electrons around wave number +/-k(F) (K-F: Fermi wave number) and apply the renormalization group method to the bosonized Hamiltonian. It is shown that the next-nearest-neighbor repulsion makes 4k(F)-charge ordering unstable and suppresses the spin fluctuation. Further the excitation gaps and spin susceptibility are also evaluated., Mar. 2001, 70, 3, 762, 773, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Crossover from quarter-filling to half-filling in a one-dimensional electron system with a dimerized and quarter-filled band, M Tsuchiizu; H Yoshioka; Y Suzumura, The interplay between quarter-filled and half-tilled umklapp scattering has been examined by applying the renormalization group method to a one-dimensional quarter-filled electron system with dimerization, on-site (U) and nearest-neighbor (V) repulsive interactions. The phase diagram on the U-V plane is obtained at absolute zero temperature where the Mott, insulator (the charge ordered insulator) is found for smaller (larger) V. By choosing the moderate parameter in the region of Mott insulator, it is shown that the resistivity exhibits a crossover from behavior of quarter-filling to that of half-filling with decreasing temperature., Jun. 2001, 70, 6, 1460, 1463, Scientific journal
  • Not Refereed, JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, PERGAMON-ELSEVIER SCIENCE LTD, Two kinds of metallic states in carbon nanotubes - differences in transport properties, H Yoshioka, The differences between the metallic states with two valleys (2 nu) and with one valley (1 nu), both of which are realized in carbon nanotubes, are investigated through Tomonaga-Luttinger liquid behaviors in the transport properties due to the impurity potential. It is shown that the effects of Coulomb interaction are stronger in the 1 nu states than in the 2 nu states. The possibility of observation of the present results in multi wall carbon nanotubes is discussed. (C) 2000 Elsevier Science Ltd. All rights reserved., Jan. 2001, 62, 1-2, 413, 417, Scientific journal
  • Not Refereed, JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, PERGAMON-ELSEVIER SCIENCE LTD, Commensurability in one-dimensional electron systems at quarter-filling, H Yoshioka; M Tsuchiizu; Y Suzumura, We examine the role of commensurability in electronic states and excitations for a one-dimensional interacting electron system at quarter-filling with on-site (U), nearest-neighbor (V-1) and next-nearest-neighbor (V-2) repulsive interactions, By applying the renormalization group method to the bosonized model, it is shown that the next-nearest-neighbor repulsion stabilizes 2k(F) density waves and induces the excitation gap in spin fluctuation for V-2 > U/2, (C) 2000 Elsevier Science Ltd. All rights reserved., Jan. 2001, 62, 1-2, 419, 422, Scientific journal
  • Not Refereed, PHYSICA B, ELSEVIER SCIENCE BV, Effects of a transverse electric field on charge-density waves, M Hayashi; H Yoshioka, A transverse electric field (a field perpendicular to the quasi-one-dimensional conducting chains) applied to a charge-density wave (CDW) causes frustration in the ordered state and has similar effects to a magnetic field applied to a superconductor. We study the equilibrium states of CDW in the transverse electric field paying attention to this similarity. Corresponding to type-I and type-II superconductivity, two types of CDW are investigated. (C) 2000 Elsevier Science B.V, All rights reserved., Jul. 2000, 284, 1535, 1536, Scientific journal
  • Not Refereed, PHYSICA B, ELSEVIER SCIENCE BV, Correlation gap in one-dimensional quarter-filled electron system, M Tsuchiizu; H Yoshioka; Y Suzumura, Umklapp scattering in an one-dimensional quarter-filled electron system with both on-site U(> 0) and nearest-neighbor V(> 0) interactions is examined by applying the renormalization group method to the bosonized Hamiltonian. We calculate a correlation gap, which appears for V larger than a critical value. In such a case, the spin density wave (SDW) coexists with the charge disproportion with two-fold periodicity. (C) 2000 Elsevier Science B.V. All rights reserved., Jul. 2000, 284, 1547, 1548, Scientific journal
  • Not Refereed, PHYSICA B, ELSEVIER SCIENCE BV, Effects of Coulomb interaction on resistivity of metallic carbon nanotubes with impurity potential, H Yoshioka, Transport properties of two kinds of metallic states, which have been found in single wall carbon nanotubes, are examined in the presence of impurity potential and long-range Coulomb interaction. It is shown that Coulomb interaction leads to the power-law dependence in the resistivity as a function of temperature, and modifies the power of frequency dependence of the optical conductivity at zero temperature, which is seen in high frequency. However, the powers are different between both the states. (C) 2000 Elsevier Science B.V. All rights reserved., Jul. 2000, 284, 1756, 1757, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Correlation effects in a one-dimensional quarter-filled electron system with repulsive interactions, H Yoshioka; M Tsuchiizu; Y Suzumura, A one-dimensional electron system at quarter-filling has been examined by applying the renormalization group method to a bosonized model with on-site (U) and nearest-neighbor (V) repulsive interactions. By evaluating both normal scattering and Umklapp scattering perturbatively, we obtain a phase diagram in which a metallic state with a 2k(F) spin density wave (k(F) is the Fermi wave number) mol-es into an insulating state with charge disproportionation of a 4k(F) charge density wave with an increase in both U and V. The effect of the next-nearest-neighbor repulsion is also discussed., Mar. 2000, 69, 3, 651, 654
  • Not Refereed, PHYSICAL REVIEW B, AMER PHYSICAL SOC, Transport properties of disordered carbon nanotubes with long-range Coulomb interaction, H Yoshioka, Transport properties of disordered carbon nanotubes are investigated including long-range Coulomb interaction. The resistivity and optical conductivity are calculated by using the memory functional method. In addition, the effect of localization is taken into account by use of the renormalization-group analysis, and it is shown that the backward scattering of the intravalley and that of the intervalley cannot coexist in the localized regime. Differences between the transport properties for the metallic state with two valleys and those with one valley are discussed., Mar. 2000, 61, 11, 7316, 7319, Scientific journal
  • Not Refereed, LOW-DIMENSIONAL SYSTEMS, SPRINGER-VERLAG BERLIN, Correlated electrons in carbon nanotubes, AA Odintsov; H Yoshioka, Single-wall carbon nanotubes are almost ideal systems for the investigation of exotic many-body effects due to non-Fermi liquid behavior of interacting electrons in one dimension. Recent theoretical and experimental results are reviewed with a focus on electron correlations. Starting from a microscopic lattice model we derive an effective phase Hamiltonian for conducting single-wall nanotubes with arbitrary chirality. The parameters of the Hamiltonian show very weak dependence on the chiral angle, which makes the low-energy physics of conducting nanotubes universal. The temperature-dependent resistivity and frequency-dependent optical conductivity of nanotubes with impurities are evaluated within the Luttinger-like model. Localization effects are studied. In particular, we found that intra-valley and inter-valley electron scattering can not coexist at low energies. Low-energy properties of clean nanotubes are studied beyond the Luttinger liquid approximation. The strongest Mott-like electron instability occurs at half filling. In the Mott insulating phase electrons at different atomic sublattices form characteristic bound states. The energy gaps occur in all modes of elementary excitations and estimate at 0.01 - 0.1 eV. We finally discuss observability of the Mott insulating phase in transport experiments. The accent is made on the charge transfer from external electrodes which results in a deviation of the electron density from half-filling., 2000, 544, 97, 111, International conference proceedings
  • Not Refereed, SYNTHETIC METALS, ELSEVIER SCIENCE SA, Resistance of carbon nanotubes connected to reservoirs, H Yoshioka; AA Odintsov, A phase Hamiltonian of conducting carbon nanotubes with an arbitrary chirality is given which takes account of the long range Coulomb interaction and the microscopic lattice structure. By using this Hamiltonian, the transport properties at half-filling are investigated for the case that the system is adiabatically connected to reservoirs., Jun. 1999, 103, 1-3, 2527, 2528, Scientific journal
  • Not Refereed, EUROPHYSICS LETTERS, E D P SCIENCES, Persistent current and correlation effects in carbon nanotubes, AA Odintsov; W Smit; H Yoshioka, The persistent current of interacting electrons in toroidal single-wall carbon nano-tubes is evaluated within Haldane's concept: of topological excitations. The overall pattern of the persistent current corresponds to the constant interaction model, whereas the fine structure stems from the electronic exchange correlations., Mar. 1999, 45, 5, 598, 604, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Theoretical study on the charge gap of organic conductor - Bechgaard salts, M Tsuchiizu; H Yoshioka; Y Suzumura, The charge gap in a quarter-filled organic conductor, which is induced hy dimerization and/or alternating potential is studied by applying the renormalization group method to the bosonized one-dimensional Kamiltonian. The interplay of dimerization and alternating potential gives rise to the unconventional enhancement of the charge gap in addition to the on-site repulsive interaction. The experimental results of resistivity and optical conductivity in Bechgaard salts are examined based on the present calculation., Jun. 1999, 68, 6, 1809, 1812
  • Not Refereed, PHYSICAL REVIEW B, AMER PHYSICAL SOC, Universality of electron correlations in conducting carbon nanotubes, AA Odintsov; H Yoshioka, An effective low-energy Hamiltonian of interacting electrons in conducting single-wall carbon nanotubes with arbitrary chirality is derived from the microscopic lattice model. The parameters of the Hamiltonian show very weak dependence on the chiral angle, which makes the low-energy properties of conducting chiral nanotubes universal. The strongest Mott-Like electron instability at half filling is investigated within the self-consistent harmonic approximation. The energy gaps occur in all modes of elementary excitations and estimate at 0.01-0.1 eV. [S0163-1829(99)50616-4]., Apr. 1999, 59, 16, 10457, 10460, Scientific journal
  • Not Refereed, PHYSICAL REVIEW LETTERS, AMERICAN PHYSICAL SOC, Electronic properties of armchair carbon nanotubes: Bosonization approach, H Yoshioka; AA Odintsov, The phase Hamiltonian of armchair carbon nanotubes at half filling and away from it is derived from the microscopic lattice model by taking the long-range Coulomb interaction into account. We investigate the low-energy properties of the system using the renormalization group method. At half filling, the ground state is a Mott insulator with a spin gap, in which bound states of electrons are formed at different atomic sublattices., Jan. 1999, 82, 2, 374, 377, Scientific journal
  • Not Refereed, JOURNAL DE PHYSIQUE IV, E D P SCIENCES, Charge density wave in a transverse electric field, M Hayashi; H Yoshioka, A transverse electric field (a field perpendicular to the quasi-one-dimensional conducting chains) applied to a charge density wave (CDW) has similarities with a magnetic field applied to a superconductor: both cause frustration in the ordered state and, thus, can induce various intriguing states. We study the equilibrium states of CDW in a transverse electric field employing Ginzburg-Landau type effective free energy of the ordered state. We found that there are two types of CDW, corresponding to type-I and type-II superconductivity: in type-I CDW, the order is completely destroyed in the surface region as we increase the transverse field, whereas in type-II CDW the dislocations (topological defects) are created, thus avoiding the complete destruction of the order. We discuss the condition for type-I and type-II CDW., Dec. 1999, 9, P10, 145, 147, Scientific journal
  • Not Refereed, PHYSICA C, ELSEVIER SCIENCE BV, Response functions of two-coupled chains of Tomonaga-Luttinger liquids, H Yoshioka; Y Suzumura, Properties of fluctuations in two chains of Tomonaga-Luttinger liquids coupled by the interchain hopping have been studied by calculating retarded response functions chi(rho)(R)(q(x), q(y); omega) for charge and chi(sigma)(R)(q(x), q(y); omega) for spin where q(x) and q(y)(= 0 or pi) denote the longitudinal and transverse wave vector, respectively, and omega is the frequency. We have found the notable fact that the repulsive intrachain interaction results in the clear enhancement of Im chi(sigma)(R)(q(x), pi; omega) and the suppression of Im chi(rho)(R)(q(x), pi; omega) at low energies. This result indicates the importance of the dynamical effect by the spin fluctuation with q(y) = pi and small omega, which has a possibility to give rise to the attractive interaction for the electron pairing. (C) 1998 Published by Elsevier Science B.V. All rights reserved., Dec. 1998, 309, 1-2, 151, 160, Scientific journal
  • Not Refereed, Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu, Effects of Spin Defects on Spin-Peierls Systems, H. Yoshioka; Y. Suzumura, We study the spin-Peierls states in the presence of spin defects for CuGeO3 where magnetic ions Cu2+ are replaced by non-magnetic ones Zn2+. Based on the action for the bosonized Hamiltonian, we investigate the spatial dependence of the phase which expresses the spin fluctuation. Further, we calculate temperature dependence of the magnetic susceptibility by taking account of the spatial variation of the phase. [spin-Peierls state, impurity effect, magnetic susceptibility, phase Hamiltonian, CuGeO3]. © 1998, The Japan Society of High Pressure Science and Technology. All rights reserved., 1998, 7, 656, 658, Scientific journal
  • Not Refereed, PROGRESS OF THEORETICAL PHYSICS, KYOTO UNIV, Crossover between high and low energy-states in two-coupled chains of Tomonaga model, M Tsuchiizu; H Yoshioka; Y Suzumura, By applying the renormalization group method to two-coupled chains in the Tomonaga model, the role of interchain hopping has been studied in the entire energy region. The energy for a crossover from the perturbational regime to the relevant regime becomes smaller than that of the interchain hopping due to one-dimensional fluctuations of the mutual interaction. From the calculation of response functions for charge density waves and superconducting states, the phase diagram of dominant and subdominant states has been obtained in the plane of mutual interactions with fixed energy., Nov. 1997, 98, 5, 1045, 1062, Scientific journal
  • Not Refereed, SYNTHETIC METALS, ELSEVIER SCIENCE SA LAUSANNE, A study of quasi-one-dimensional conductors based on two coupled chains, H Yoshioka; Y Suzumura, Based on the bosonization method, we show that the phase transition between SDW and superconductivity of the quasi-one-dimensional organic conductors can be understood by the crossover in the two coupled chains. Further, remarkable behaviors of the charge and spin susceptibilities with the transverse wavenumber pi are calculated as a function of the longitudinal wavenumber and the frequency., Feb. 1997, 85, 1-3, 1613, 1614, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, Spin defects in spin-Peierls systems, H Yoshioka; Y Suzumura, We examine spin-Peierls states in the presence of spin defects for CuGeO3 where magnetic ions Cu2+ replaced by non-magnetic ones Zn2+. Based on the action for the bosonized Hamiltonian, the state is investigated by using path integral method. The temperature of spin-Peierls transition T-SP and, the spin gap and the magnitude of the averaged lattice dimerization in the ground state have been calculated as a function of doping. From comparison of the present TSP with the experimental result, a good agreement is obtained for the transition temperature of Cu-1-deltaZndeltaGeO3 in the region of the doping rate, delta < 0.02., Dec. 1997, 66, 12, 3962, 3969, Scientific journal
  • Not Refereed, JOURNAL OF LOW TEMPERATURE PHYSICS, PLENUM PUBL CORP, Properties of fluctuations in two coupled chains of Luttinger liquids, H Yoshioka; Y Suzumura, Two chains of Luttinger liquids coupled by both interchain hopping and interchain interaction are investigated A degeneracy of two kinds of dominant states with in phase and out of phase ordering in the absence of the hopping is removed since the transverse fluctuation of charge density is completely gapful and that of spin density has two kinds of excitation with and without gap. The crucial effect of the interchain hopping on the electronic properties is studied by calculating susceptibilities., Jan. 1997, 106, 1-2, 49, 72, Scientific journal
  • Not Refereed, PHYSICAL REVIEW LETTERS, AMERICAN PHYSICAL SOC, Topological dislocations and mixed state of charge density waves, M Hayashi; H Yoshioka, We discuss the possibility of the ''mixed state'' in incommensurate charge density waves with three-dimensional order. The mixed state is created by applying an electric field perpendicular to the chains. This state consists of topological dislocations induced by the external field and is therefore similar to the mixed states of superfluids (type-II superconductors or liquid helium II). However, the peculiar coupling of charge density waves with the electric field strongly modifies the mixed state compared to conventional superfluids. The field and temperature dependence of the properties of the mixed state are studied, and some experimental aspects are discussed., Oct. 1996, 77, 16, 3403, 3406, Scientific journal
  • Not Refereed, PHYSICAL REVIEW B, AMERICAN PHYSICAL SOC, Spin-density wave versus superconducting fluctuations for quasi-one-dimensional electrons in two chains of Tomonaga-Luttinger liquids, H Yoshioka; Y Suzumura, We study possible states at low temperatures by applying the renormalization group method to two chains of Tomonaga-Luttinger liquids with both repulsive intrachain interactions and interchain hopping. As the energy decreases below the hopping energy, three distinct regions I, III, and II appear successively depending on properties of fluctuations. The crossover from the spin-density wave (SDW) state to superconducting (SC) state takes place in region UI where there are the excitation gaps of transverse charge and spin fluctuations. The competition between SDW and SC states in region III is crucial to understanding the phase diagram in the quasi-one-dimensional organic conductors., Oct. 1996, 54, 13, 9328, 9331, Scientific journal
  • Refereed, Physical Review B - Condensed Matter and Materials Physics, Spin-density wave versus superconducting fluctuations for quasi-one-dimensional electrons in two chains of Tomonaga-Luttinger liquids, Hideo Yoshioka; Yoshikazu Suzumura, We study possible states at low temperatures by applying the renormalization group method to two chains of Tomonaga-Luttinger liquids with both repulsive intrachain interactions and interchain hopping. As the energy decreases below the hopping energy, three distinct regions I, III, and II appear successively depending on properties of fluctuations. The crossover from the spin-density wave (SDW) state to superconducting (SC) state takes place in region III where there are the excitation gaps of transverse charge and spin fluctuations. The competition between SDW and SC states in region III is crucial to understanding the phase diagram in the quasi-one-dimensional organic conductors. © 1996 The American Physical Society., 1996, 54, 13, 9328, 9331, Scientific journal
  • Not Refereed, CZECHOSLOVAK JOURNAL OF PHYSICS, CZECHOSLOVAK JNL OF PHYSICS, Dielectric properties of the mixed states of charge density waves, M Hayashi; H Yoshioka, The dielectric properties of the mixed states of charge density waves are investigated. The electric screening due to the charge density waves and the non-linear dielectric constant are studied based on the free energy of the topological dislocations, and the observation of the mixed state in condenser geometry is discussed., 1996, 46, Suppl. S5, 2607, 2608, Scientific journal
  • Not Refereed, MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS, GORDON BREACH SCI PUBL LTD, From two coupled chains to quasi-one-dimensional organic conductors, H Yoshioka; Y Suzumura, Electronic states of two coupled chains of interacting electron systems are investigated by means of phase Hamiltonian, and phase transition of quasi-one-dimensional organic conductors are discussed from the point of view of the two chains., 1996, 285, 229, 234, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, ROLES OF INTERCHAIN HOPPING IN 2 COUPLED CHAINS OF TOMONAGA MODEL, H YOSHIOKA; Y SUZUMURA, Two chains of interacting spinless fermions in the presence of interchain hopping are investigated by use of phase Hamiltonian based on bosonization method. Excitation spectrum and phase diagram at absolute zero temperature are obtained by means of renormalization group method. Momentum distribution functions are also calculated. It is shown that the interchain hopping gives rise to drastic effects on properties of ground state compared to interchain interaction and is crucial to appearance of ordered states in higher dimensions., Oct. 1995, 64, 10, 3811, 3825, Scientific journal
  • Not Refereed, SYNTHETIC METALS, ELSEVIER SCIENCE SA, BOSONIZATION APPROACH TO 2 CHAINS COUPLED BY THE ELECTRON HOPPING, H YOSHIOKA; Y SUZUMURA, Based on bosonization method, the system where two chains of spinless Tomonaga model are coupled by a transverse hopping is investigated. Due to the appearance of the gap in one of the two excitations, the powers of correlation functions of charge density wave and superconductivity become just the half of those in the absence of the hopping., Apr. 1995, 71, 1-3, 1967, 1968, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, SPIN MAGNETISM IN MESOSCOPIC METALS, H YOSHIOKA, Fluctuation of spin magnetic susceptibility square-root [deltachi(s)2] in mesoscopic metals is discussed in comparison with that of orbital magnetic susceptibility square-root [deltachi(L)2]. It is found that a ratio square-root [deltachi(s)2]/ square-root [deltachi(L)2] is independent of temperature and the boundary condition and has a magnitude of the order of (1/epsilon(F)tau)2 which is much smaller than unity, epsilon(F) and tau being Fermi energy and the relaxation time of the elastic scattering, respectively. Scattering dependent on electron spin (e.g., spin-orbit interaction or scattering by impurity spin in the glass state) are shown to suppress square-root [deltachi(s)2] far more strongly than square-root [deltachi(L)2]. The results indicate that the anomalously large fluctuation of the magnetic susceptibility compared to the average, which is expected to be observed experimentally, results from the orbital motion., Feb. 1994, 63, 2, 405, 408
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, 2 COUPLED CHAINS OF TOMONAGA MODEL, H YOSHIOKA; Y SUZUMURA, Two chains of spinless Tomonaga model coupled by a transverse hopping are investigated in terms of phase Hamiltonian where separation of Fermi momentum in the presence of the hopping is taken into account explicitly. It is shown that there appears a gap in one of the two excitations by using a renormalization group method. As a result, correlation of charge density wave with interchain ordering and out of phase between the chains (superconductivity with intrachain ordering and in phase between the chains) becomes the most dominant one in the case of the repulsive (attractive) intrachain interaction., Dec. 1994, 63, 12, 4298, 4301
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, FLUCTUATIONS OF JOSEPHSON CURRENTS AND PERSISTENT CURRENTS IN MESOSCOPIC SPIN-GLASS SYSTEMS, H YOSHIOKA; H FUKUYAMA, Effects of correlation of the spin scattering between different measurements in the presence of the spin glass ordering have been investigated for mesoscopic fluctuations of Josephson currents in SNS junctions and those of persistent currents in isolated Aharonov-Bohm (AB) rings. It is found that, because of the absence of the time reversal symmetry, fluctuations of Josephson currents do not vanish even if the phase difference of two superconductors is zero and those of persistent currents in the absence of AB flux is also not zero. Moreover the characteristic length of exponential decay of the fluctuation of Josephson currents can be much longer than that of the average., Feb. 1993, 62, 2, 612, 623, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOCIETY JAPAN, PERSISTENT CURRENT OF DIRAC SEA - APPLICATION TO BISMUTH, H KOHNO; H YOSHIOKA; H FUKUYAMA, Bismuth has been known to exhibit anomalously large diamagnetism which has been interpreted on the basis of the effective Hamiltonian of the Dirac type including spin-orbit coupling. Here the persistent current in a mesoscopic ring of bismuth is calculated. It is found that the magnetic flux induces persistent currents which have a spatial spread of the order of xi = 2hupsilon/E(g) (upsilon: velocity of the 'Dirac' electron; E(G): energy gap), just as in the atomic diamagnetism whose "atomic" size is gigantic and of mesoscopic scale., Oct. 1992, 61, 10, 3462, 3465
  • Not Refereed, Transport Phenomena in Mesoscopic Systems, Fluctuations of Josephson Currents in Mesoscopic Systems, YOSHIOKA Hideo; H. Yoshioka; H. Fukuyama, 1992, 263, 271
  • Not Refereed, New Horizons in Low-Dimensional Electron Systems, MESOSCOPICS AND SUPERCONDUCTIVITY, YOSHIOKA Hideo; H. Fukuyama; H. Yoshioka, 1992, 369, 375
  • Not Refereed, PHYSICA C, ELSEVIER SCIENCE BV, THE HC/E VS HC/2E OSCILLATIONS IN THE SNS JUNCTION, H YOSHIOKA; H FUKUYAMA, The Josephson current induced by the proximity effect is studied for the SNS junction with the mesoscopic Aharonov-Bohm ring in the normal region. The results shows that the critical current has a component with hc/e oscillation in addition to hc/2e oscillation, the former of which is particular to the mesoscopic system. The relative intensity of these two oscillation will be discussed for various cases., Dec. 1991, 185, 1625, 1626, Scientific journal
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOCIETY JAPAN KIKAI-SHINKO BUILDING, PROXIMITY EFFECT IN A MESOSCOPIC RING STRUCTURE, H YOSHIOKA; H FUKUYAMA, Sep. 1990, 59, 9, 3065, 3068
  • Not Refereed, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOCIETY JAPAN KIKAI-SHINKO BUILDING, EFFECT OF MAGNETIC-FIELD ON THE CONDUCTANCE OF BALLISTIC QUANTUM WIRE, H YOSHIOKA; Y NAGAOKA, Aug. 1990, 59, 8, 2884, 2892, Scientific journal
  • Refereed, Journal of the Physical Society of Japan, Physical Society of Japan, Theory of the Strain Engineering of Graphene Nanoconstrictions, Masahiko Hayashi; Hideo Yoshioka; Hikari Tomori; Akinobu Kanda, Strain engineering is a key technology for using graphene in electronic devices; the strain-induced pseudo-gauge field reflects Dirac electrons, which opens the so-called conduction gap. Because strain accumulates in constrictions, graphene nanoconstrictions are a good platform for this technology. However, it is also known that Fabry-Pérot type quantum interference plays an important role in the electrical conduction of the graphene nanoconstrictions at low bias voltages. We argue that these two effects have different strain dependences; the pseudo-gauge field gives a "strain-even"[symmetric with respect to positive (tensile) and negative (compressive) strain] contribution, whereas the quantum interference gives a "strain-odd"(antisymmetric) contribution. As a result, a peculiar dependence of conductance on strain appears, even at typical room temperatures., 15 Feb. 2021, 90, 2, 023701, 023701, Scientific journal
  • Not Refereed, 日本物理学会講演概要集, The Physical Society of Japan (JPS), 22pAC-3 Control of Strain in Shaped Graphene Nanoribbon Bridge, 林正彦; 吉岡英生; 友利ひかり; 神田,晶申, Mar. 2015, 70, 1, 1847, 1847, Symposium
  • Refereed, Europhysics Letters, Observation of Riemannian geometrical effects on electronic states, J. Onoe; T. Ito; H. Shima; H. Yoshioka; S. Kimura, Einstein first applied Riemannian geometry to develop the general theory of relativity almost one hundred years ago and succeeded in understanding astronomical-scale phenomena such as the straining of time-space by a gravitational field. Whether or not Riemannian space affects the electronic properties of condensed matters on a much smaller scale is of great interest. Although Riemannian geometry has been applied to quantum mechanics since the 1950s, nobody has yet answered this question, because the electronic properties of materials with Riemannian geometry have not been examined experimentally. We report here the first observation of Riemannian geometrical effects on the electronic properties of materials such as Tomononaga-Luttinger liquids, which were previously theoretically predicted by our group. We present in situ high-resolution ultraviolet photoemission spectra of a one-dimensional metallic C60 polymer with an uneven periodic peanut-shaped structure., 2012, 98, 2, 27001, Scientific journal
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 23pAC-9 Charge ordering in one-dimensional molecular conductors with localized spins and effects of external magnetic field on it, Kayano A.; Yoshioka H., 2015, 70, 1872, 1872
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, Transport properties of junctions composed of Haldane model, Tatsumi Tomoko; Yoshioka Hideo; Hayashi Masahiko,

    ランダウ準位が形成されなくても量子ホール効果を示す2次元蜂の巣格子模型(Haldane模型)の輸送特性を議論する.次近接格子間の電荷移動を含む模型を取り扱えるように再帰グリーン関数法を拡張し,Haldane模型からなる接合系のコンダクタンスを数値的に計算する.リード線が通常金属である場合や,異なるチャーン数をもつ模型を組み合わせた接合系について詳細な解析を行う.

    , 2016, 71, 1105, 1105

MISC

  • 計算工学講演会論文集(CD-ROM), 金属フラーレンポリマーの安定原子構造と電子状態計算, 吉岡英生; 島弘幸; 野田祐輔; 小野頌太; 大野かおる, 2017, 22
  • 日本物理学会講演概要集(CD-ROM), 金属フラーレンポリマーにおける朝永ラティンジャー液体理論, 吉岡英生; 島弘幸; 野田祐輔; 小野頌太; 大野かおる, 2016, 71, 2
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 10aAG-8 Effects of uniform and staggered magnetic field on electronic states of one-dimensional molecular conductors, Kayano Akane; Yoshioka Hideo, 22 Aug. 2014, 69, 2, 624, 624
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 26pXN-8 Enhancement of charge ordering by external magnetic field in one-dimensional molecular conductors II, Yoshioka Hideo; Seo Hitoshi; Otsuka Yuichi, 26 Mar. 2013, 68, 1, 911, 911
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 19aEB-10 Enhancement of charge ordering by external magnetic field in one-dimensional molecular conductors, Yoshioka Hideo; Seo Hitoshi; Otsuka Yuichi, 24 Aug. 2012, 67, 2, 767, 767
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 27aXN-10 Fiedel oscilation in carbon nanotubes, Yoshioka H.; Okamura Y., 01 Mar. 2002, 57, 1, 805, 805
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), Charge and spin fluctuation in the charge ordered state of one-dimensional ex-tended Hubbard model at half-filling, Hashizume Y.; Yoshioka H., 13 Aug. 2002, 57, 2, 724, 724
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 25pTF-11 Properties of charge ordered states of quasi one dimensional molecular conductors at finite temperatures : Theoretical analysis by combination of numerical method and bosonization, Yoshioka H.; Tsuchiizu M.; Otsuka Y.; Seo H., 29 Feb. 2008, 63, 1, 829, 829
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 28pYH-9 Transport properties of nano-graphen ribbon junctions, Mochizuki Y.; Yoshioka H., 03 Mar. 2009, 64, 1, 841, 841
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 28pRB-17 Interchain mean field approach to charge ordering of quasi one-dimensional molecular conductors at quarter-filling, Yoshioka H.; Tsuchiizu M.; Seo H., 04 Mar. 2006, 61, 1, 831, 831
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 20aGS-4 Interaction dependence in magnetism of graphane nanoribbons with zigzag shaped edges, Furukawa K.; Yoshioka H., 01 Mar. 2010, 65, 1, 853, 853
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 26pYE-11 Transport properties of nano-graohen ribbon junctions II, Mochizuki Y.; Yoshioka H., 18 Aug. 2009, 64, 2, 765, 765
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 27pYC-6 Theoretical study of quasi-one-dimensional molecular conductors by means of bosonization, Yoshioka Hideo, 18 Aug. 2009, 64, 2, 776, 776
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 27pYC-6 THeoretical study of quasi-one-dimensional molecular conductors by means of bosonization, Yoshioka Hideo, 18 Aug. 2009, 64, 2, 556, 556
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 26pTB-12 Effects of disorder on charge ordering in quasi-one-dimensional molecular conductors, Yoshioka H., 03 Mar. 2011, 66, 1, 871, 871
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 23aXA-4 Bias-voltage-based control of the Tomonaga-Luttinger exponent for quasi-1D conductors, Shima Hiroyuki; Ono Shota; Yoshioka Hideo, 18 Aug. 2010, 65, 2, 638, 638
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 25pF-11 Transport Pheuomena of Carbon Nanotubes due to Impurity Seattering, Yoshioka H, 03 Sep. 1999, 54, 2, 752, 752
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 24aE-7 Charge Gap Induced by Nearest-Neighbor Repulsion in One-Dimensional 1/4-Filled Electron System, Tsuchiizu M.; Yoshioka H.; Suzumura Y., 03 Sep. 1999, 54, 2, 726, 726
  • Abstracts of the meeting of the Physical Society of Japan. Sectional meeting, The Physical Society of Japan (JPS), 5a-D-3 Bosonization Approach to Two Chains Coupld to the Electron Hopping I, Yoshioka Hideo; Suzumura Yoshikazu, 16 Aug. 1994, 1994, 3, 525, 525
  • Abstracts of the meeting of the Physical Society of Japan. Sectional meeting, The Physical Society of Japan (JPS), 13p-DF-10 Effects of Competition of Interaction between Electrons and Spin-Orbit Interaction on Persistent Currents, Yoshioka Hideo; Fukuyama Hidetoshi, 20 Sep. 1993, 1993, 3, 435, 435
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), Electronic states of quarter filled one-dimensional electron systems with repulsive interactions, Yoshioka H.; Tsuchiizu M.; Suzumura Y., 10 Mar. 2000, 55, 1, 738, 738
  • Abstracts of the meeting of the Physical Society of Japan. Sectional meeting, The Physical Society of Japan (JPS), Vortices and Mixed State of Charge Density Waves II, HAYASHI Masahiko; YOSHIOKA Hideo, 13 Sep. 1996, 1996, 2, 456, 456
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), Role of quarter-filling in the charge gap of Bechgaard salts, Tsuchiizu M.; Yoshioka H.; Suzumura Y., 09 Mar. 2001, 56, 1, 774, 774
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), NMR relaxation time of carbon nanotubes, Yoshioka H., 09 Mar. 2001, 56, 1, 737, 737
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), High resolution photoemission spectroscopy of single-wall carbon nanotubes II, Shiozawa H.; Ishii H.; Kataura H.; Kihara H.; Otsubo H.; Takayama Y.; Miyahara T.; Suzuki S.; Achiba Y.; Nakatake M.; Yoshioka H.; Narimura T.; Higashiguchi M.; Shimada K.; Namatame H.; Taniguchi M., 15 Aug. 2003, 58, 2, 654, 654
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 5p-C-8 Renormalization Group Approach to Two-Coupled Chains System I, Tsuchiizu M.; Yoshioka Y.; Suzumura Y., 16 Sep. 1997, 52, 2, 270, 270
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 31a-N-6 Effects of Non-Magnetic Impurities on Spin-Peiels Systems, Yoshioka Hideo; Suzumura Yoshikazu, 17 Mar. 1997, 52, 1, 503, 503
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 29a-XA-6 Effects of Electron Correlation on Carbon Nanotubes, Yoshioka H.; Odintsov A.A., 15 Mar. 1999, 54, 1, 249, 249
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 28p-XB-2 Charge Gap of Quarter-Filled Organic Conductors, Tsuchiizu M.; Yoshioka H.; Suzumura Y., 15 Mar. 1999, 54, 1, 246, 246
  • Abstracts of the meeting of the Physical Society of Japan. Annual meeting, The Physical Society of Japan (JPS), 29p-YF-1 Spin Magnetism in Mesoscopic Metals, Yoshioka Hideo, 16 Mar. 1994, 49, 3, 385, 385
  • Abstracts of the meeting of the Physical Society of Japan. Annual meeting, The Physical Society of Japan (JPS), 31p-T-12 Transition of the Eletron System and Macroscopic Quantum Tunneling, AWAKA Kaoru; YOSHIOKA Hideo; FUKUYAMA Hidetoshi, 16 Mar. 1993, 48, 3, 356, 356
  • Abstracts of the meeting of the Physical Society of Japan. Annual meeting, The Physical Society of Japan (JPS), 30p-N-5 Persistent Currents in a Quantum Ring, Tamura Hiroyuki; Yoshioka Hideo, 16 Mar. 1993, 48, 2, 152, 152
  • 秋の分科会講演予稿集, The Physical Society of Japan (JPS), Proximity Effect in a Mesoscopic Ring Structure, Yoshioka H.; Fukuyama H., 02 Oct. 1990, 1990, 3, 227, 227
  • 年会講演予稿集, The Physical Society of Japan (JPS), Effect of Finite Size Magnetic Field in Quantum Wire, Yoshioka Hideo; Nagaoka Yosuke, 16 Mar. 1990, 45, 3, 167, 167
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 24aPS-30 High-Resolution Photoemission Spectroscopy of Single-Wall Carbon Nanotubes and Fullerene-peapod II, Kihara H.; Shiozawa H.; Sasaki N.; Nakamura S.; Yoshida T.; Takayama Y.; Ishii H.; Miyahara T.; Kodama K.; Suzuki S.; Achiba Y.; Kataura H.; Yoshioka H.; Higashiguchi M.; Cui X. Y.; Arita M.; Nakatake M.; Shimaa K.; Namatame H.; Taniguchi M., 04 Mar. 2005, 60, 1, 664, 664
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 13pPSA-10 High-Resolution Photoemission Spectroscopy of Single-Wall Carbon Nanotubes and Fullerene-peapod, Kihara H.; Shiozawa H.; Takayama Y.; Ishii H.; Miyahara T.; Suzuki S.; Achiba Y.; Kataura H.; Yoshioka H.; Higashiguchi M.; Cui X. Y.; Arita M.; Nakatake M.; Shimada K.; Namatame H.; Taniguchi M., 25 Aug. 2004, 59, 2, 658, 658
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 30pZP-7 Properties of nanographite ribbons with zigzag edges : Difference between odd and even chains, Yoshioka H.; Higahibara S., 03 Mar. 2004, 59, 1, 880, 880
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 30pZP-6 Photoemission spectroscopy on single-wall carbon nanotubes and fullerene peapods II, Shiozawa H.; Kihara H.; Ishii H.; Kataura H.; Takayama Y.; Miyahara T.; Kodama T.; Suzuki S.; Achiba Y.; Yoshioka H.; Higashiguchi M.; Nakatake M.; Shimada K.; Namatame H.; Taniguchi M., 03 Mar. 2004, 59, 1, 879, 879
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 30aPS-9 Photoemission spectroscopy of fullerone-peapod, Kihara H.; Shiozawa H.; Ishii H.; Kataura H.; Takayama Y.; miyahara T.; Kodama K.; Suzuki S.; Achiba Y.; Yoshioka H.; Higashiguchi M.; Nakatake H.; Shimada K.; Namatame H.; Taniguchi M., 03 Mar. 2004, 59, 1, 756, 756
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), Commensurate-incommensurate transition in a one-dimensional dimerized electron system close to quarter-filling, Yoshioka H.; Tsuchiizu M.; Suzumura Y., 03 Sep. 2001, 56, 2, 682, 682
  • Abstracts of the meeting of the Physical Society of Japan. Sectional meeting, The Physical Society of Japan (JPS), Bosonization Approach to Two Chains Coupled to the Electron Hopping III, Yoshioka Hideo; Suzumura Yoshikazu, 12 Sep. 1995, 1995, 3, 648, 648
  • 年会講演予稿集, The Physical Society of Japan (JPS), 30p-ZK-11 The hc/e vs. hc/2e oscillations in the SNS Junction, Yoshioka H.; Fukuyama H., 12 Sep. 1991, 46, 3, 385, 385
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), Oscillator strength of metallic carbon nanotubes, Yoshioka H., 10 Sep. 2000, 55, 2, 731, 731
  • Abstracts of the meeting of the Physical Society of Japan. Annual meeting, The Physical Society of Japan (JPS), 31a-D-9 Approach to the Phase Diagram at Low Temperature of Quasi-One-Dimensional Organic Conductors from Two Chains, Yoshioka Hideo; Suzumura Yoshikazu, 15 Mar. 1996, 51, 2, 336, 336
  • Abstracts of the meeting of the Physical Society of Japan. Annual meeting, The Physical Society of Japan (JPS), 31a-D-7 Vortices and Mixed State of Charge Density Waves, HAYASHI Masahiko; YOSHIOKA Hideo, 15 Mar. 1996, 51, 2, 335, 335
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), Photoemission Spectroscopy of Single-Wall Carbon Nanotubes and Fullerene Peapods, Shiozawa H.; Ishii H.; Kataura H.; Otsubo H.; Takayama Y.; Miyahara T.; Suzuki S.; Achiba Y.; Nakatake M.; Yoshioka H.; Narimura T.; Higashiguchi M.; Shimada K.; Namatame H.; Taniguchi M., 06 Mar. 2003, 58, 1, 800, 800
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), High-Resolution Photoemission Spectroscopy of Single-Wall Carboa Nanotubes, Shiozawa H.; Ishii H.; Kataura H.; Otsubo H.; Takayama Y.; Miyahara T.; Suzuki S.; Achiba Y.; Nakatake M.; Yoshioka H.; Narimura T.; Higashiguchi M.; Shimada K.; Namatame H.; Taniguchi M., 06 Mar. 2003, 58, 1, 720, 720
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), Local density of states in metallic carbon nanotubes, Yoshioka H.; Okamura Y., 06 Mar. 2003, 58, 1, 817, 817
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 28a-A-5 Effect of a Transverse Electric Field on Charge Density Waves, Hayashi M.; Yoshioka H., 15 Mar. 1999, 54, 1, 520, 520
  • Abstracts of the meeting of the Physical Society of Japan. Annual meeting, The Physical Society of Japan (JPS), Bosonization Approach to Two Chains Coupled to the Electron Hopping II, Yoshioka Hideo; Suzumura Yoshikazu, 16 Mar. 1995, 50, 3, 532, 532
  • 年会講演予稿集, The Physical Society of Japan (JPS), 27a-B-2 Fluctuation of Josepfson currents in mesoscopic SNS systems, Yoshioka H.; Fukuyama H., 12 Mar. 1992, 47, 3, 217, 217
  • 秋の分科会講演予稿集, The Physical Society of Japan (JPS), 26p-P-13 Persistent Current of Dirac Sea : Application to Bismuth, KOHNO Hiroshi; YOSHIOKA Hideo; FUKUYAMA Hidetoshi, 14 Sep. 1992, 1992, 3, 279, 279
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 23pTC-3 Incommensurate antiferromagnetic state in off-1/2-filled system κ-ET_4Hg_<3-x>X_8(X=Br,Cl), Seo Hitoshi; Yoshioka Hideo, 25 Aug. 2008, 63, 2, 793, 793
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 23pTC-2 Metal-insulator transition of two dimensional molecular conductors close to quarter filling : Analysis by mean field approximation, Yoshioka H.; Seo H., 25 Aug. 2008, 63, 2, 793, 793

Presentations

  • 上平美紗稀; 土射津昌久; 吉岡英生, 日本物理学会第75回年次大会, 1次元交互積層型電荷移動錯体の比熱に関する理論的研究, 16 Mar. 2020
  • 吉岡英生; 辰己智子; 島弘幸, 日本物理学会2019年秋季大会, 朝永ラティンジャー液体理論に基づいた金属フラーレンポリマーのスペクトル関数の理論的考察, 12 Sep. 2019
  • 辰己智子; 吉岡英生; 林正彦, 日本物理学会2019年秋季大会, 磁性不純物を含むアームチェア型Kane-Mele模型リボンの輸送特性, 12 Sep. 2019
  • 深川千宙; 辰己智子; 吉岡英生, 日本物理学会第74回年次大会, ナノリボンの量子スピンホール状態における磁気秩序Ⅱ, 17 Mar. 2019
  • 辰己智子; 吉岡英生; 林正彦, 日本物理学会第74回年次大会, 磁性不純物がランダムに分布した二次元蜂の巣格子模型の輸送特性, 14 Mar. 2019
  • TATSUMI Tomoko; YOSHIOKA Hideo; HAYASHI Masahiko, TMS2019, Transport properties of two dimensional quantum spin Hall insulators with magnetic impurities, 22 Jan. 2019
  • 深川千宙; 辰己智子; 吉岡英生, 第12回物性科学領域横断研究会, ジグザグ型ナノリボンの量子スピンホール状態における磁気秩序, 30 Nov. 2018
  • 辰己智子; 吉岡英生; 林正彦, 第12回物性科学領域横断研究会, 1つの磁性不純物を含む2次元量子スピンホール絶縁体の輸送特性, 30 Nov. 2018
  • 深川千宙; 辰己智子; 吉岡英生, 日本物理学会2018年秋季大会, ナノリボンの量子スピンホール状態における磁気秩序, 09 Sep. 2018
  • 辰己智子; 吉岡英生; 林正彦, 日本物理学会2018年秋季大会, 磁性不純物を含む二次元蜂の巣格子模型の輸送特性, 09 Sep. 2018
  • 日本物理学会第73回年次大会, 二次元蜂の巣格子単原子層物質の輸送特性, 2018
  • KAYANO Akane; YOSHIOKA Hideo, ISCOM2017, Charge Ordering of Quarter-Filled One-Dimensional Extended Hubbard Model with π-d Coupling, 25 Sep. 2017
  • 日本物理学会第72回年次大会, 歪み導入グラフェンの電気伝導の理論, 2017
  • 日本物理学会第72回年次大会, Haldane模型の輸送特性に対する不純物散乱の効果, 2017
  • International Conference on Topological Materials Science 2017, Transport properties of ribbon consisting of Haldane Model, 2017
  • 日本物理学会2017年秋季大会, Haldane模型の輸送特性に対する不純物散乱の効果Ⅱ, 2017
  • International Conference on Topological Materials Science 2017, Transport properties of ribbon consisting of Haldane Model, 2017
  • パイ電子系物性科学の最前線, 局在スピンを含む一次元分子性導体における電荷秩序とそれに対する外部磁場の効果, 2016
  • 日本物理学会2016年秋季大会, Haldane模型からなる接合系の輸送特性, 2016
  • 日本物理学会2016年秋季大会, 金属フラーレンポリマーにおける朝永 ラティンジャー液体理論, 2016
  • Yukawa Institute for Theoretical Physics (YITP) international workshop "Physics of bulk-edge correspondence and its universality: From solid state physics to cold atoms" [ BEC2016 ], Transport properties of junctions composed of Haldane model, 2016
  • Yukawa Institute for Theoretical Physics (YITP) international workshop "Physics of bulk-edge correspondence and its universality: From solid state physics to cold atoms" [ BEC2016 ], Transport properties of junctions composed of Haldane model, 2016
  • 日本物理学会 第70回年次大会, 架橋構造のグラフェン・ナノリボンにおける形状による歪みのコントロール, 2015
  • 日本物理学会 第70回年次大会, 局在スピンを含む一次元分子性導体における電荷秩序とそれに対する外部磁場の効果, 2015
  • 日本物理学会2015年秋季大会, BN上グラフェンへの局所1軸ひずみ導入法の開発, 2015
  • 日本物理学会2015年秋季大会, 中性イオン性転移系のボゾン化による相図と低エネルギー励起の解析, 2015
  • 日本物理学会第69回年次大会, グラフェンの電気伝導における形状効果について, 2014
  • 日本物理学会 2014年秋季大会, 一次元分子性導体の電子状態に対する一様磁場と交替磁場の効果, 2014
  • 大阪大学理学部花咲研究室セミナー, Theoretical Studies for effects of magnetic field on TPP[Co(Pc)(CN)2]2 and TPP[Co(Pc)(CN)2]2, 2014
  • 日本物理学会 第68回年次大会, 一次元分子性導体における磁場による電荷秩序の増強Ⅱ, 2013
  • 日本物理学会 第67回年次大会, 局所歪みのあるグラフェンの電気伝導測定, 2012
  • The 19th International Conference on Magnetism with Strongly Correlated Electron Systems (SCES), Enhancement of charge ordering by Zeeman effect in one-dimensional molecular conductors, 2012
  • 日本物理学会 2012年秋季大会, 一次元分子性導体における磁場による電荷秩序の増強, 2012
  • International Symposium Material Science Opened by Molecular Degree of Freedom (MDF2012), Enhancement of Charge Ordering due to External Magnetic Field in One-Dimensional Molecular Conductors, 2012
  • The 19th International Conference on Magnetism with Strongly Correlated Electron Systems (SCES), Enhancement of charge ordering by Zeeman effect in one-dimensional molecular conductors, 2012
  • International Symposium Material Science Opened by Molecular Degree of Freedom (MDF2012), Enhancement of Charge Ordering due to External Magnetic Field in One-Dimensional Molecular Conductors, 2012
  • スプリングセミナー「物性物理の現状と展望」, 擬1次元電子系の電荷秩序状態―ボゾン化法,繰り込み群,数値的手法を組み合わせた解析―, 2011
  • 日本物理学会第66回年次大会, 擬一次元分子性導体の電荷秩序に対する乱れの効果, 2011
  • 日本物理学会第66回年次大会, 架橋グラフェンジョセフソン接合の作製と電界効果, 2011
  • 26th International Conference on Low Temperature Physics, Collapse of Charge Ordering Due to Disorder in Quasi One-Dimensional Electron Systems, 2011
  • 26th International Conference on Low Temperature Physics, Supercurrent through Monolayer and Multilayer Graphene, 2011
  • 26th International Conference on Low Temperature Physics, Properties of Graphene Nanoribbon with Zigzag Edges Attached to Two Normal Metals, 2011
  • 日本物理学会 2011年秋季大会, 擬一次元分子性導体の電荷秩序形成に対する乱れの効果, 2011
  • グラフェン・ナノ構造の物理, 正常金属-グラフェンナノリボン-正常金属接合系の電気伝導特性, 2011
  • 2011年数学・物理学・情報科学の研究交流シンポジウム, 固体中のディラック電子系 -グラフェンを中心に-, 2011
  • 26th International Conference on Low Temperature Physics, Collapse of Charge Ordering Due to Disorder in Quasi One-Dimensional Electron Systems, 2011
  • 26th International Conference on Low Temperature Physics, Supercurrent through Monolayer and Multilayer Graphene, 2011
  • 26th International Conference on Low Temperature Physics, Properties of Graphene Nanoribbon with Zigzag Edges Attached to Two Normal Metals, 2011
  • International Conference on Science and Technology of Synthetic Metals 2010 (ICSM2010), Effects of Disorder on Charge Ordering Transition in Quasi-One-Dimensional Molecular Conductors, 2010
  • The International Conference on Theoretical Physics, “Dubna-Nano2010”, Superconducting proximity effect in graphene nanostructures, 2010
  • グラフェンと超伝導体のナノ構造に関する研究会, ジグザグ型グラフェンナノリボンの磁性における異常な相互作用依存性, 2010
  • 日本物理学会2010年秋季大会, 擬一次元導体が示す朝永-Luttinger指数のバイアス電場制御, 2010
  • 日本物理学会2010年秋季大会, グラフェンにおける超伝導近接効果の理論Ⅱ, 2010
  • 第18回渦糸国内会議, グラフェンにおける超伝導近接効果の理論, 2010
  • International Conference on Science and Technology of Synthetic Metals 2010 (ICSM2010), Effects of Disorder on Charge Ordering Transition in Quasi-One-Dimensional Molecular Conductors, 2010
  • The International Conference on Theoretical Physics, “Dubna-Nano2010”, Superconducting proximity effect in graphene nanostructures, 2010
  • 林正彦; 吉岡英生; 友利ひかり; 神田晶申, 日本物理学会第76回年次大会, グラフェン・ナノコンストリクションの電気伝導におけるひずみ導入効果の理論, 15 Mar. 2021, 12 Mar. 2021, 15 Mar. 2021
  • 西本真侑; 吉岡英生; 島弘幸, 日本物理学会第77回年次大会, 多チャンネル朝永ラッティンジャー液体理論に基づいた金属フラーレンポリマーのスペクトル関数の理論的考察, Poster presentation, 17 Mar. 2022, 15 Mar. 2022, 19 Mar. 2022, rm:research_project_id
  • 渡利江里奈; 吉岡英生, 日本物理学会第77回年次大会, スピン欠陥を有する一次元分子性導体の電荷秩序の実空間平均場理論による考察, Poster presentation, 17 Mar. 2022, 15 Mar. 2022, 19 Mar. 2022
  • Tomoko Tatsumi; Hideo Yoshioka; Masahiko Hayashi, EP2DS-24/MSS-20, Numerical Study on Transport Properties of the Junction Composed of Trivial Insulators, Poster presentation, 05 Nov. 2021, 31 Oct. 2021, 05 Nov. 2021
  • Masahiko Hayashi; Hideo Yoshioka; Hikari Tomori; Akinobu Kanda, EP2DS-24/MSS-20, Effects of Strain on the Graphene Nanoconstrictions, Poster presentation, 05 Nov. 2021, 31 Oct. 2021, 05 Nov. 2021
  • 西本真侑; 吉岡英生; 島弘幸, 日本物理学会2022年秋季大会, 金属フラーレンポリマーの電気抵抗と光学伝導度の理論的考察, 13 Sep. 2022, 12 Sep. 2022, 15 Sep. 2022
  • Hideo Yoshioka; Tomoko Tatsumi; Masahiko Hayashi, 29th International Conference on Low Temperature Physics, Comparison of Transport Properties in Hybrid Trivial Insulators with Those in Topological Insulators, 22 Aug. 2022, 18 Aug. 2022, 24 Aug. 2022
  • Mayu Nishimoto; Hideo Yoshioka; Hiroyuki Shima, 29th International Conference on Low Temperature Physics, Effects of Unevenness on the Spectral Functions of One-Dimensional Conductors, 19 Aug. 2022, 18 Aug. 2022, 24 Aug. 2022

Research Projects

  • Grant-in-Aid for Scientific Research (C), Apr. 2015, Mar. 2019, 15K04619, Development of real-scale simulation methods for nanostructure conductors and creation of new functions, Hayashi Masahiko; Yoshioka Hideo; Tanuma Yasunari, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Akita University, 4810000, 3700000, 1110000, With regard to the electrical conductivity in nano-structured conductors described by tight-binding models, we performed calculations using the recursive Green's function method, and developed large-scale calculation scheme using singular value decomposition. Based on them, we made various theoretical predictions of electrical conduction in strained graphene and topological insulators. In addition, within the t-J model describing high-temperature superconductors and Ginzburg-Landau theory derived from it, we have studied electronic states and diamagnetism in terms of the self-consistent harmonic approximation and other methods. Based on the above findings, novel devices have been proposed., url
  • Grant-in-Aid for Scientific Research (C), Apr. 2013, Mar. 2017, 25400370, Theoretical study on control of electronic states in low-dimensional molecular conductors, Yoshioka Hideo; TERAO Haruhiko; Tsuchiizu Masahisa, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Nara Women's University, 4940000, 3800000, 1140000, We investigated the electronic states of low dimensional strongly correlated electron system, such as molecular conductors, inorganic oxides and graphene related materials, by using various theoretical methods. In addition, we explored the possibility for control of the various states by the external fields. For example, we succeeded in explaining the discrepancy between TTF[Co(Pc)CN2]2 and TTF[Fe(Pc)CN2]2 in the magnitude of resistivity and in the sign of magnetoresistance. In addition, we developed the improved renormalization group method and applyed it to high-Tc cuprate superconductors and Ruthenium oxides. We obtained many results which can explain the experimantal observations., url
  • Grant-in-Aid for Scientific Research (C), 2010, 2012, 22540329, Electronic correlation and transport phenomena in carbon based quasi-one-dimensional material graphene nanoribbon, YOSHIOKA Hideo; HAYASHI Masahiko; KANDA Akinobu, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Nara Women's University, 4290000, 3300000, 990000, In the project, we theoretically investigated several quantities in the magnetic ordered states of graphene nanoribbon with zigzag shaped edges and the transport properties of the junctions composed of graphene and metal which is in the normal and superconducting state, respectively. In addition, we fabricated the junctions corresponding to above theoretical studies and that with distorted graphene and investigated the transport properties., url
  • Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), 2008, 2012, 20110004, Control of electronic states by spin degrees of freedom, UJI Shinya; OGATA Masao; SEO Hitoshi; OSHIMA Yugo; YAMAGUCHI Takahide; KONOIKE Takako; OTSUKA Yuichi; FUSEYA Yuki; YOSHIOKA Hideo; OHTA Hitoshi; ISHIHARA Sumio; MOTOME Yukitoshi; NISHIO Yutaka, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), National Institute for Materials Science, 143910000, 110700000, 33210000, Various layered organic conductors including both conducting π electrons in the organic layers and localized 3d electrons in the anion layers have been synthesized so far. The magnetic interaction between the π and 3d spins (π-d interaction) is known to lead to fascinating phenomena, such as field-induced superconductivity and colossal magnetoresistance. In this project, we have successfully control the π electron states via the π-d interaction and theoretically clarified the microscopic mechanism of the π-d interaction., url;url
  • Grant-in-Aid for Scientific Research on Priority Areas, 2006, 2007, 18028018, 有限温度における擬一次元分子性導体の電荷秩序の理論-量子揺らぎと高次元性の共存-, YOSHIOKA Hideo; KATO Takeo, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas, Nara Women's University, 3600000, 3600000, 擬一次元電子系で見出されている様々な秩序状態の有限温度における性質を理論的に考察するには、従来、純粋な一次元の模型に対して平均場近似が適用されてきた。しかしながら、純粋な一次元系は有限温度で相転移しないことが知られているため、そのような理論的取り扱いは不十分である。我々は、「ボソン化・繰り込み群」という解析的な手法と「有限系の厳密対角化」という数値的な手法を組み合わせて有限温度における一次元系の様々な物理量をより定量的に記述することのできる理論を構築した。その理論を一次元拡張ハバード鎖が鎖間相互作用で結合した擬一次元電子系に適用して、擬一次元分子性導体の電荷秩序状態におけるスピン磁化率や電気抵抗の温度依存性を考察した。我々が用いた手法並びに得られた結果は以下のとおりである。擬一次元拡張ハバード模型に対して鎖間平均場近似を適用し、得られた有効一次元模型をボソン化法で取り扱う。その際、ハミルトニアンは電荷の自由度を表わす部分とスピンの自由度を表わす部分に分けられ、それぞれダブルサインゴルドン模型、通常のサインゴルドン模型によって記述される。そこに現れるパラメータを厳密対角化によって決定し、その値を初期値として繰り込み群方程式を解き、有限温度のいろいろな物性を議論する。スピン磁化率は電荷秩序転移温度で何も異常を示さないが、電荷秩序がない場合に比べその値は大きくなる。これは、スピン励起の速度の減少が原因である。一方、電荷の自由度によって記述される電気抵抗は電荷秩序転移温度で傾きの変化を伴って大きくなる。この結果は実験で観測された電気抵抗の振る舞いと定性的に一致する。さらに、電荷秩序近傍の電荷揺らぎの成長が二次元系の様々な応答に対してどのような効果を及ぼすかについてRPA近似を超えた考察を行なった。
  • Grant-in-Aid for Scientific Research on Priority Areas, 2004, 2005, 16038218, 電荷秩序を示す分子性導体の核磁気共鳴に対する理論的研究, YOSHIOKA Hideo, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas, Nara Women's University, 2100000, 2100000, 1.充填率1/4一次元分子性導体の電荷秩序状態におけるナイトシフトと核スピン緩和率 ナイトシフトや核スピン緩和率の分裂が電荷秩序状態の実験的証拠と考えられ、またこれらの分裂幅から電荷不均一性が見積もられている。しかし、充填率1/4の場合にはその主張をサポートする理論的研究が行なわれていなかった。本研究では充填率1/4一次元拡張ハバード模型に対して平均場近似からのゆらぎをRPAで取り込んで純粋な電荷秩序状態におけるナイトシフトと核スピン緩和率を計算し、実際上記の主張が正しいことを示した。さらに、核磁気共鳴の実験から見積もられた電荷不均一性は実際の値よりも大きくなるという結果を得た。 2.充填率1/4擬一次元分子性導体の電荷秩序形成に対する鎖間平均場からのアプローチ これまでの研究から、擬一次元分子性導体の電荷秩序現象を記述する最も簡単な理論的な模型は格子内斥力Uだけでなく最近接間斥力Vを有する一次元拡張ハバード摸型であることがわかっており、実際基底状態ではUとVが大きい領域で電荷秩序絶縁体状態が現れることが見出されている。しかしながら、厳密な一次元系では強い量子ゆらぎのために、その転移温度は絶対零度である。したがって、実験で観測されている有限温度での相転移を議論するためには、純粋な一次元だけでは不十分であり、鎖間結合による高次元性を考慮しなければいけない。本研究では鎖間結合として異なった鎖間の電子間相互作用を取り入れた。鎖間相互作用を平均場近似で取り扱い、その結果得られた有効一次元模型をボソン化法で取り扱った。その結果、有限温度での電荷秩序の出現の仕方にはU-V平面で三つの定性的に異なった領域に分けられることが見出された。
  • Grant-in-Aid for Scientific Research (C), 2003, 2005, 15540343, Theoretical study of anomalous fluctuation and it's effects on dynamical properties of one-dimensional conductors, YOSHIOKA Hideo, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Nara Women's University, 3000000, 3000000, In collaboration with the experimental group, we directly observed the density of state of carbon nanotubes by the photo emission study. It was shown that Tomonaga-Luttinger liquid state is realized in the carbon nanotubes in the wide range of the temperature from 10 K to room temperature. The nano-graphite ribbons are known to have the anomalous dispersion relation near the Fermi energy different from the usual metals. We investigated the electronic correlation of the materials. It was shown that the mutual interaction leads to Mott insulating ground state and the spin excitation becomes gapless (gapped) for the odd (even) number of zigzag chains. 2.Splitting of the Knight shift and of the NMR relaxation rate have been considered to be the experimental evidence of charge ordering in the molecular conductors. In the case of quarter-filling, however, no one show theoretically that the charge ordering leads to such phenomena. In the present study, we calculated the Knight shift and the NMR relaxation rate in the pure charge ordered state of one-dimensional extended Hubbard model. Here, the fluctuation around the mean-field solution is taken into account by RPA. It is shown that the both quantities show splitting under the charge ordering, as has been already insisted. In addition, the amount of charge disproportionation estimated from the NMR experiments becomes larger than the actual value. 3.Quite recently, the materials with incommensurate decomposition ratios close to 2:1 such as (MDT-TSF)_2X_n, (MDT-ST)_2X_n, and (MDT-TS)_2X_n with X being a monovalent anion and n=0.42〜0.45 have been synthesized and the transport and magnetic properties of these compounds have been measured. The materials (MDT-TSF)_2X_n and (MDT-ST)_2X_n show metallic conduction and undergo the superconducting transition at 4 K for ambient pressure. On the other hand, (MDT-TS)_2(AuI_2)_<0.441> shows the metal-insulator transition at 85 K. In order to clarify why the metal-insulator transition occurs in the case of incommensurate band filling, we investigated the ground state of one-dimensional extended Hubbard model with incommensurate lattices. When the potential from the anions is taken into account, the ground state is Mott insulator, and the increase of band width leads to metal-insulator transition. These results will qualitatively explain the experimental observation shown above.
  • Grant-in-Aid for Scientific Research (C), 2002, 2004, 14540302, Theory of Coulomb Blockade in Carbon Nanotubes, IWABUCHI Shuichi; YOSHIOKA Hideo, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Nara Women's University, 3100000, 3100000, We proposed a self-consistent microscopic theory of the Coulomb blockade in the capacitively coupled single-electron transistor structure with Tomonaga-Luttinger liquid island connected with FL electrodes at both ends (TLL C-SET). Candidates for the island of TLL C-SET are carbon nanotubes and quantum wires. In this theory, the charging effect and the Tomonaga-Luttinger nature are treated in a consistent manner by the open boundary bosonization technique with consideration of zero modes based on the theory of C-SET for Fermi liquid electrodes. Analytical expression of the tunneling current in TLL C-SET is obtained up to the lowest order with respect to the tunneling Hamiltonian for arbitrary environmental impedance and it reasonably describes current-voltage characteristics caused by Coulomb blockade in Tomonaga-Luttinger liquid. We showed that, in the ultrasmall but finite Tomonaga-Luttinger liquid, interaction-dependent exponent of the power law has system size dependence in addition to contact- (bulk- or edge-) nature dependence. Electronic properties of carbon nanotube and carbon nanotube families are also studied. NMR relaxation rate, spin excitation and Friedel oscillation of local charge density are discussed. In future, based on the specific TLL theory to carbon nanotubes, the theory proposed in this research should be extended in order to understand the details of the current-voltage characteristics experimentally found.
  • Grant-in-Aid for Scientific Research (A), 2001, 2003, 13304026, Single-molecular physics of single-walled nanotubes encapsulating magnetic metals, KATAURA Hiromichi; TSUKAGOSHI Kazuhito; KODAMA Takashi; SUZUKI Shinzo; FUJIWARA Akihiko; YOSHIOKA Hideo, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Tokyo Metropolitan University, 54600000, 42000000, 12600000, We have synthesized high-quality single-wall carbon nanotubes by the laser ablation methods and revealed interesting natures of them as listed below. 1.We have first confirmed one-dimensional van Hove singularities by means of photoemission spectroscopy by using highly purified single-wall carbon nanotubes. Furthermore, we have fond two power law dependences of electronic density of states (DOS). The first one is power law dependence of DOS on the binding energy and the second one is power law of DOS at the Fermi level on the temperature. The exponents are 0.46 and 0.48, respectively that just agree with the theoretical predictions for the one-dimensional metallic system so called Tomonaga Luttinger liquid (TLL) system. Our result is the most reliable evidence that the TLL system is realized even in the bundle of single-wall carbon nanotubes. 2.The isolated nanotubes embedded in the support materials were synthesized by chemical vapor deposition of ethanol and the optical properties of them were measured. The sample shows very narrow radial breathing Raman peaks with the half width less than 1.5 cm-1. The Raman spectrum does not contain any peaks peculiar to the bundles. This new sample gave us useful information about electronic structure of carbon nanotubes and the selection rule of the optical transition. 3.When we introduced water molecules into carbon nanotubes, we found that water molecules transformed to ice-nanotubes at low temperature. By changing the diameter of carbon nanotubes we can control the diameter of ice-nanotube. We found that ice nanotube with different diameter has different freezing point. The larger diameter of ice-nanotube leads to the lower freezing point, which is opposite to the empirical rule. 4.We have synthesized single-wall carbon nanotubes encapsulating metallo-fullerenes and have done some spectroscopic measurements. Double wall carbon nanotube formation was also investigated by X-ray diffraction and Raman spectroscopy.
  • Grant-in-Aid for Young Scientists (B), 2001, 2002, 13740220, カーボンナノチューブにおける電子相関効果の理論的研究, YOSHIOKA Hideo, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Nara Women's University, 1900000, 1900000, 本年度は昨年度に引き続き、カーボンナノチューブや有機導体を対象にして以下のような一次元電子系の研究を行なった。 「カーボンナノチューブ」 金属カーボンナノチューブでは、通常の三次元金属とは異なり、朝永-ラティンジャー液体状態と呼ばれる新奇な電子状態が実現していることが理論的に示され、実験的にもそれを支持する結果が得られている。これまでこの物質の理論的研究は、バルクの性質を議論するために周期境界条件を用いて行なわれてきたが、実際の物質は1μm程度の長さを持つため、端の効果も重要となる。この新奇な電子状態に対する端の効果に着目し、端を有するカーボンナノチューブの朝永-ラティンジャー液体理論を構築した。さらに、その理論に基づいて、電荷密度や状態密度の空間依存性を詳しく論じた。 「一次元有機導体」 電荷秩序は擬一次元有機導体の研究の一つのホットな話題であり、その状態の性質は詳細に研究されてきている。たいていの有機導体は充填率が1/4であるが、極最近合成された有機導体(TTM-TTP)I_3は充填率が1/2である。この物質においても電荷秩序状態が実現していることを示唆する実験報告がなされているため、充填率1/2一次元電子系の電荷秩序状態における様々な性質を有効作用理論に基づいて調べた。電荷及びスピン感受率、励起スペクトルとその重み、核磁気緩和率、ナイトシフト等を議論した。特に、電荷秩序状態が実現しサイトの種類が2種類になっても、ナイトシフトは1本であり、核磁気緩和率は1種類であることを見出した。この結果は充填率1/2系の粒子-正孔対称性によるものである。
  • Grant-in-Aid for Encouragement of Young Scientists (A), 1999, 2000, 11740196, カーボンナノチューブにおける電子相関の理論, YOSHIOKA Hideo, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Encouragement of Young Scientists (A), 2200000, 2200000, 本年度はカーボンナノチューブや一次元有機導体を対象にして以下のような一次元電子系の研究を行った。 ●カーボンナノチューブ カーボンナノチューブにみられる二種類の金属状態、即ちゼロ磁場で実現される金属状態(二つの谷を持つ)と半導体カ-ボンナノチューブに軸に平行な磁場を印加することによって実現される金属状態(一つの谷を持つ)の電気抵抗と光学伝導度をボルン近似を用いて計算し、電子間長距離クーロン相互作用の効果の違いを議論した。その結果、二種類の金属状態とも電子間相互作用は電気抵抗の非整数巾的な温度依存性をもたらすが、その効果は谷が一つの状態の方が強いという結果を得た。また、光学伝導度に関しては、低振動数領域、高振動数領域の両方で二種類の金属状態とも電子間相互作用により非整数巾の振動数依存性がみられるが、その効果は谷が一つの状態の方が強いことを示した。このように、電子間相互作用の効果は谷が一つの金属状態で強く現れることが判った。また、カーボンナノチューブの振動子強度をタイトバインディング模型を用いて計算した。そして、いくつかの普遍的な関係式を導き、カーボンナノチューブへの電子もしくはホールのドープ量を決定するための有用な式を得た。 ●一次元有機導体 昨年度の研究を拡張して、ボソン化法にくりこみ群を援用し、格子内斥力U、最近接格子間斥力V_1、次近接格子間斥力V_2をもつ1/4充填一次元電子系の電子状態の研究を行なった。そして、基底状態の相図を決定し、それからの低エネルギー励起に関して様々な知見を得た。本研究中で、スピン励起にギャップを持つ状態が、V_1の大きさによらずU<2V_2で実現するを示した。この状態は従来の平均場近似による研究で得られていなかったものであり、本研究で完全に取り入れられている量子揺らぎが本質的な役割を果たすことによって実現した状態であると考えられる。
  • Grant-in-Aid for Scientific Research (C), 1997, 2000, 09640429, Unconventional low dimensional fluctuation in organic conductors, SUZUMURA Yoshikazu; YOSHIOKA Hideo, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Nagoya University, 2900000, 2900000, We have studied theoretically the following system based on the bosonization in order to study a role of correlation and fluctuation in low dimensional organic conductors. (i) The transition from insulator to metal occurs under pressures in the normal state of Bechgaard salts, which exhibit the charge gap. Such a transition is determined by a ratio of the charge gap to the interchain hopping. The mechanism has been studied by use of two-coupled chains with a half-filled band, in which the one-dimensional fluctuation is treated in terms of the renormalization group method. It is demonstrated that the confinement occurs when the charge gap becomes larger than than the interchain hopping. Further the effect of the electron-filling from the commensurate state has been examined. (2) The spin density wave of organic conductors exhibits a novel transition at temperature of the 1/3 of the critical temperature. By using a phase Hamiltonian for two-coupled chains of SDW, the effect of the phase difference between chain has been investigated by use of the transfer integral method. It is shown that the competition between the commensurability energy and interchain coupling gives rise to the transition from the commensurate state to the incommensurate state. (3) The effect of impurity in two-coupled spinless chain has been studied to understand the role of interchain hopping in quasi-one-dimensional systems. It is found that the one-dimensional localization occurs when the pinning energy of impurity becomes larger than the interaction induced interchain gap. Besides the above results, we have examined the electronic state of one-dimensional electrons, collective modes of spin density wave and the impurity effect on spin Peirls system.
  • Grant-in-Aid for Scientific Research (C), 1996, 1998, 08640483, Theoretical Study of Transport Phenomena based on Mori Formula, KURODA Yoshihiro; YOSHIOKA Hideo; ONO Yoshiaki; SUZUMURA Yoshikazu; MATSUURA Tamifusa, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Nagoya University, 2100000, 2100000, Very recently we have found that the ordinary perturbation technique based on the Feynrnan's diagram can be applied to calculate the Mori formura for electrical resistivity. (J.Phys. Soc. Japan 64 No.11 (1995) 4092-4096) The aim of the present project was to utilize the new expression of the Mori formura for examining the traditional understanding of the Mori formula itself and searching possibility of its extensive application, e.g., for calculation of the transport coefficients in many electron systems. As it should be, the Mori formula must be equivalent to the Kubo formula. In fact, we have confirmed the equivalence explicitly for resitivity due to impurity scattering and optical conductivity in 2 band systems. (J.Phys. Soc. Japan 65 No.2 (1996) 525-528) Moreover, with the help of some identities which hold among dynamical correlation functions, it. has been shown that the both formulae are equivalent to each other rigorously. (J.Phys. Soc. Japan 65 No.2 (1996) 342-344) However, in real systems we must rely upon the some approximation procedure and it may happen that there occurs some discrepancy between results obtained through the two formulae. In fact, it has been widely believed that when we calculate electrical resistivity the memory function approximation based on the Mori formula is more convinient to he used. Then, in order to check whether it. is really so or not, we have calculated electrical resistivity clue to the impurity scattering and also that clue to the d-p hybridization term by applying the same approximation procedure to the two formulae and shown that the both results are identical and the memory function approximation is justified at high frequency limit, which invalidiate the traditional way of its application. (J.Phys. Soc. Japan 66 No.9 (1997) 2790-2797)。 In conclusion, we argue that the Mori formula and the Kubo formula are identical to each other as far as the same approximation procedure are applied.
  • Grant-in-Aid for Scientific Research on Priority Areas, 1996, 1996, 08223215, 重い電子形成と物質異常, 松浦 民房; 吉岡 英生; 大野 義章; 黒田 義浩, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas, Nagoya University, 600000, 600000, 重い電子形成とそれに伴う物性異常をアンダーソン格子模型を用いて研究してきた。電子間に働く強い斥力の効果を補助粒子(slave boson,pseudo-fermion)及び束縛条件を用い、1/N展開法を援用して調べてきた。得られた結論は以下のようである。 1.CeRu_2Si_2のメタ磁性の起源について1/N展開の0次近似の範囲で調べた。地場が存在しないときにはslave bosonのエネルギーがpseudo-fermionのエネルギーより低く、伝導電子はLuttingerの総和則による大きなフェルミ面を持った状態になる。しかし地場の増大とともに、pseudo-fermionのエネルギーが下がり、slave bosonの準位と逆転する。この結果、フェルミ面は小さくなる。これはdHvAによる観測と一致し、またその際のdM/dHの跳び、Mの急な増大とも一致する。 2.強相関電子系(d-p模型)に存在する強い電荷揺らぎによる超伝導発現の可能性を調べた。電荷揺らぎの振動数依存性を取り入れると(遅延効果)超伝導が出現する。 3.強相関電子系(d-p模型)の磁気揺らぎと電荷ゆらぎを調べ桁。局所的にslave boson,pseudo-fermionを交換する過程によるバ-テックスをRPAにより取り入れると、磁気揺らぎ電荷揺らぎは競合する結果を得た。d-p模型では、dopingの小さい所では磁気揺らぎが勝ち、dopingの大きい所では電荷揺らぎが勝つ。 4.強相関電子系に存在する強い磁気揺らぎが伝導電子の状態に及ぼす影響を調べた。伝導電子は磁気揺らぎによりその分散関係を変えられ、特に反強磁性の発生する領域では不安定となり、系は絶縁体となる。
  • Grant-in-Aid for Scientific Research on Priority Areas, 1995, 1995, 07233213, 重い電子形成と物性異常, 松浦 民房; 吉岡 英生; 大野 義章; 黒田 義浩, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas, Nagoya University, 1000000, 1000000, 重い電子形成とそれに伴う物性異常をアンダーソン格子模型を用いて研究してきた。f電子間に働く強い斥力の効果を補助粒子(slave boson,pseudo-fermion)及び束縛条件を用い、1/N展開法を援用して調べてきた。 1.非磁性不純物効果アンダーソン格子中の非磁性不純物(Ce_<1-x>La_xCu_6等)効果を調べた。低温では伝導電子にunitary limitの抵抗を与えることを示した。 2.U=finite不純物効果U=finiteの不純物効果を調べた。そのため、f電子の占有数が2個(スピン一重項状態)に対応するdoubly-occupied-state operatorを導入しUとε_fの大小についての全て場合の様子を明らかにした。 3.CeRu_2Si_2のメタ磁性の起源について1/N展開の0次近似の範囲で調べ、実験と一致する結果を得た。 4.強相関電子系の電荷ゆらぎを調べた。heavy fermion系における電荷ゆらぎとd-p模型の電荷揺らぎを比較し、その違いの原因を明らかにした。 5.アンダーソン格子模型における磁気構造を1/N展開の高次となる準粒子間相互作用を取り入れて計算し、濃度と温度について磁気相図を作成した。 6.Slave Boson法を用いるときのLocal ConstraintのWickの定理に対する問題点を検討した結果、Wickの定理が成立することを示した。
  • Grant-in-Aid for General Scientific Research (C), 1993, 1995, 05640410, Spin Density and Quantum Fluctuations in Quasi-One-Dimensional Conductors, SUZUMURA Yoshikazu; YOSHIOKA Hideo, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for General Scientific Research (C), Nagoya University, 2000000, 2000000, The role of repulsive interaction in quasi-one-dimensional organic conductors has been studied in order to examine the fluctuation of spin density in low-dimensioanl electron system. Following three subjects have been investigated. (1) The fluctuation of the commensurate spin density wave (SDW) has been examined by calculating collective modes of a Hubbard model with a quarter-filled band. The longitudinal mode shows the gap and the coexistence of the 2k_F-SDW and the 4k_F-CDW.The effect of anion lattice was examined in terms of a phase Hamiltonian. (2) A role of interchain hopping in quasi-1D organic conductors was examined by applying the phase Hamiltonian based on the bosonization to two coupled chains with the repulsive interaction of backward and forward scatterings. The competition of SDW state and superconducting state explains the phase diagram of in the quasi-1D conductors. (3) The metal-insulatortarnsition in DCNQI-Cu salts was examined by applying the slave-boson mean-field theory to the periodic Anderson model with the electron-phonon (e-p) interaction. The fact that the M-I transition is the Peierls transition in the presence of the strong correlation has been shown by calculating the reentrant transition of M-I-M,the phase diagram specific heat and magnetic susceptibility, the dimensional effect and the antiferromagnetic state. Thus we have shown the mechanism of the M-I transition.
  • Grant-in-Aid for Scientific Research on Priority Areas, 1994, 1994, 06244213, 温度低下に伴う重い電子の形成と超伝導, 松浦 民房; 吉岡 英生; 大野 義章; 黒田 義浩, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas, Nagoya University, 1500000, 1500000, 温度低下に伴う重い電子の形成と超伝導 d-電子、f-電子を含む稀土類、ウラン化合物では、強い電子相関が重要な役割をしている。本研究グループは磁性原子上のd-電子、f-電子の局所相関を補助粒子(スレーブボゾン、擬フェルミオン)を用いて取り入れる方法を適用して、物理的性質を研究した。これらの強相関電子系の特徴は、高温で存在するd-電子、f-電子のスピンが低温になるにつれて、伝導電子とともにコヒーレントな伝導電子系となることが実験的に示されていることである。本研究グループは、この過程で生ずる以下の3つの現象について研究を行った。 1.超伝導体中の磁性不純物効果 BCS超伝導体中に磁性不純物が存在する系では超伝導と近藤効果の競合が起こる。本研究グループは、超伝導が支配的となり不純物が磁性的に働く領域と、近藤効果が優勢になり不純物が非磁性的に働く領域を統一的に記述できる解析的理論を提出し本質を解明した。 2.近藤絶縁体 Ce_3Bi_4Pt_3に代表される近藤絶縁体と呼ばれる新しい物質群を格子アンダーソン模型を用いて理論的に調べた。この模型に対して1粒子グリーン関数を与える自己無撞着積分方程式を導いた。この自己無撞着積分方程式を近藤絶縁体を導くパラメータ領域に対して数値的に解くことにより、近藤絶縁体出現の様子を解明した。 メタ磁性とフェルミ面 Ceやアクチナイドの金属化合物では温度低下に伴い重い電子状態が形成される。重い電子状態の形成に伴うフェルミ面の変化を調べ、ドハース・ファンアルフェン(dHvA)効果の実験と、メタ磁性の実験を説明する理論を提出した。
  • 2019, Principal investigator, 電子相関のある1 次元曲面量子系のスペクトル関数, 吉岡英生; 土射津昌久, 奈良女子大学, 奈良女子大学研究推進プロジェクト経費, 奈良女子大学
  • 2015, 局在スピンとの相互作用が生み出す擬一次元分子性導体の新奇な電子状態, 吉岡英生, 奈良女子大学, 奈良女子大学研究推進プロジェクト経費, 奈良女子大学
  • 2011, Principal investigator, 擬一次元分子性導体が示す電荷秩序絶縁体状態の制御, 吉岡英生, 奈良女子大学, 奈良女子大学研究推進プロジェクト経費, 奈良女子大学
  • 2010, Principal investigator, 正常金属-グラフェンナノリボン-正常金属接合系の電子状態の解明と輸送特性の考察, 吉岡英生, 奈良女子大学, 奈良女子大学研究推進プロジェクト経費, 奈良女子大学
  • 2009, Principal investigator, 新奇炭素系ナノ一次元物質ナノグラフェンリボンの電子状態と伝導特性の解明, 吉岡英生, 奈良女子大学, 奈良女子大学研究推進プロジェクト経費, 奈良女子大学
  • 2008, Principal investigator, 新奇炭素系ナノ一次元物質に関する基礎研究-カーボンナノチューブ、ナノグラファイトリボンにおける電子相関とその輸送特性に対する効果-, 吉岡英生, 奈良女子大学, 奈良女子大学研究推進プロジェクト経費, 奈良女子大学
  • 2003, Principal investigator, 21世紀ハイテク材料における基礎物理の理論的研究-カーボンナノチューブ・ナノグラファイトリボンの電子状態と伝導特性の解明-, 吉岡英生, 奈良女子大学, 奈良女子大学研究推進プロジェクト経費, 奈良女子大学
  • 2021, 一次元曲面量子系における有効電磁場の理論的検証, 吉岡英生; 土射津昌久, 奈良女子大学, 奈良女子大学研究推進プロジェクト経費, 奈良女子大学, rm:presentations

Ⅲ.社会連携活動実績

1.公的団体の委員等(審議会、国家試験委員、他大学評価委員,科研費審査委員等)

  • Apr. 2021, 9999
  • Sep. 2021, Mar. 2022


Copyright © MEDIA FUSION Co.,Ltd. All rights reserved.