強相関電子系理論研究室（太田研究室）千葉大学大学院理学研究科
千葉大学理学部

国際会議録（主要なもののみ）

2020

  1. "Pressure-Induced Restoration of the Reversed Crystal-Field Splitting in α-Sr2CrO4"
    R. Takahashi, T. Yamaguchi, K. Sugimoto, T. Yamauchi, H. Sakurai, and Y. Ohta
    JPS Conf. Proc. 30, 011026/1-4 (2020)

2018

  1. "Multipole ordering and collective excitations in the excitonic phase of Pr0.5Ca0.5CoO3"
    T. Yamaguchi, K. Sugimoto, and Y. Ohta
    Physica B 536, 37-39 (2018)

2017

  1. "Coherence Factors and Quantum Interferences in Excitonic Condensation of Ta2NiSe5"
    K. Sugimoto, T. Kaneko and Y. Ohta
    J. Phys.: Conf. Ser. 807, 112001/1-7 (2017)

2015

  1. "Novel Electronic Structures of Ru-Pnictides RuPn (Pn=P, As, Sb)"
    H. Goto, T. Toriyama, T. Konishi, and Y. Ohta
    Physics Procedia 75, 91-99 (2015)
  2. "Excitonic Phases in the Two Orbital Hubbard Model: Roles of Hund's Rule Coupling"
    T. Kaneko and Y. Ohta
    J. Phys.: Conf. Ser. 592, 012096/1-6 (2015)
  3. "Dimensional Crossover of the Superfluid State in the Attractive Hubbard Model"
    N. Ogawa, T. Kaneko and Y. Ohta
    J. Phys.: Conf. Ser. 592, 012103/1-6 (2015)
  4. "Frustration and Magnetic Orderings in the Square Lattice Hubbard Model with Anisotropic Next-Nearest-Neighbor Hopping"
    K. Misumi, T. Kaneko, and Y. Ohta
    J. Phys.: Conf. Ser. 592, 012113/1-6 (2015)
  5. "Coexistence of Magnetic and Topological Phases in the Asymmetric Kane-Mele-Hubbard Model"
    S. Miyakoshi and Y. Ohta
    J. Phys.: Conf. Ser. 592, 012129/1-7 (2015)

2014

  1. "Variational-Cluster-Approximation Study of the Antiferromagnetic Topological Insulator States"
    S. Miyakoshi and Y. Ohta
    JPS Conf. Proc. 3, 016011/1-6 (2014)
  2. "Spin Excitations in the Square-Lattice Heisenberg Model with Ring-Exchange Interactions"
    K. Misumi, K. Seki, and Y. Ohta
    JPS Conf. Proc. 3, 014021/1-6 (2014)
  3. "Spectral Weights of the Square-Lattice Hubbard Model with Frustration in the Magnetic and Mott Insulator Phases"
    A. Yamada, K. Seki, R. Eder, and Y. Ohta
    JPS Conf. Proc. 3, 013008/1-6 (2014)
  4. "Electronic Structure of Calcium-Ferrite-Type Cr Oxide NaCr2O4"
    T. Toriyama, T. Konishi, and Y. Ohta
    JPS Conf. Proc. 3, 017003/1-6 (2014)
  5. "Excitonic BCS-BEC Crossover in Double-Layer Systems"
    T. Kaneko, S. Ejima, H. Fehske, and Y. Ohta
    JPS Conf. Proc. 3, 017006/1-6 (2014)
  6. "Molybdenum Hollandite K2Mo8O16 as a Superatomic Crystal"
    M. Watanabe, T. Toriyama, T. Konishi, and Y. Ohta
    JPS Conf. Proc. 3, 014002/1-6 (2014)

2013

  1. "The Book-Keeping Fermion Analysis of the Double Exchange Model with Antiferromagnetic Background"
    K. Nakano, Y. Ohta, R. Eder, and P. Wróbel
    J. Korean Phys. Soc. 63, 751-755 (2013)
  2. "Variational Cluster Approach to the Hubbard Model on the Honeycomb Lattice"
    K. Seki and Y. Ohta
    J. Korean Phys. Soc. 62, 2150-2154 (2013)

2012

  1. "Hollandite Ruthenate K2Ru8O16 as a New Tomonaga-Luttinger-Liquid System"
    T. Toriyama, M. Watanabe, T. Konishi, and Y. Ohta
    J. Phys.: Conf. Ser. 400, 042063/1-4 (2012)
  2. "Mott Transition in the Hubbard Model on the Anisotropic Kagome Lattice: Variational Cluster Approach"
    A. Yamada, K. Seki, R. Eder, and Y. Ohta
    J. Phys.: Conf. Ser. 400, 032117/1-4 (2012)
  3. "Mechanism of the Metal-Insulator Transition of Hollandite Vanadate K2V8O16"
    T. Toriyama, T. Konishi, and Y. Ohta
    J. Phys.: Conf. Ser. 400, 032104/1-4 (2012)
  4. "Electronic Structure of Ta2NiSe5 as a Candidate for Excitonic Insulators"
    T. Kaneko, T. Toriyama, T. Konishi, and Y. Ohta
    J. Phys.: Conf. Ser. 400, 032035/1-4 (2012)
  5. "Anomalous Electronic States of Hollandite-Type Transition-Metal Oxides"
    Y. Ohta, T. Toriyama, M. Sakamaki, and T. Konishi
    J. Phys.: Conf. Ser. 400, 032070/1-4 (2012)
  6. "Exact Wave Functions and Excitation Spectra of the One-Dimensional Double-Exchange Model with One Mobile Electron"
    K. Nakano, R. Eder, and Y. Ohta
    J. Phys.: Conf. Ser. 400, 032063/1-4 (2012)
  7. "Ground State Properties of the S=3/2 Three-Leg Heisenberg Tube"
    Y. Fuji, S. Nishimoto, and Y. Ohta
    J. Phys.: Conf. Ser. 400, 032011/1-4 (2012)
  8. "A BCS-BEC Crossover in the Extended Falicov-Kimball Model: Variational Cluster Approach"
    K. Seki, T. Kaneko, S. Yamaki, R. Eder, and Y. Ohta
    J. Phys.: Conf. Ser. 400, 012067/1-4 (2012)
  9. "Hubbard Model on the Anisotropic Kagome Lattice: Mott Transition and Ferrimagnetism"
    A. Yamada, K. Seki, R. Eder, and Y. Ohta
    J. Phys.: Conf. Ser. 391, 012169/1-4 (2012)
  10. "Excitation Spectra of the One-Dimensional Double-Exchange Model: An Exact Solution for One Mobile Electron"
    K. Nakano, R. Eder, and Y. Ohta
    J. Phys.: Conf. Ser. 391, 012161/1-4 (2012)
  11. "Variational Cluster Approach to the Extended Falicov-Kimball Model: A BCS-BEC Crossover in the Excitonic Insulators"
    K. Seki, T. Kaneko, S. Yamaki, R. Eder, and Y. Ohta
    J. Phys.: Conf. Ser. 391, 012147/1-4 (2012)
  12. "Anomalous Electronic Structure of Transition-Metal Oxides with Hollandite-Type Crystal Structure"
    T. Toriyama, T. Konishi, and Y. Ohta
    J. Phys.: Conf. Ser. 391, 012109/1-4 (2012)

2010

  1. "Zero-Point Vacancies in the Two-Dimensional t-J2-J3-J4 Model: 3He on Graphite Surface"
    K. Seki and Y. Ohta
    Physica C 470, S970-S971 (2010)
  2. "Nonquasiparticle States in the Half-Metallic Ferromagnet Simulated by the Two-Band Hubbard Model"
    K. Nakano, T. Shirakawa, and Y. Ohta
    J. Phys.: Conf. Ser. 200, 012143/1-4 (2010)
  3. "Magnetic Susceptibility and Saturation Magnetic Field in the t-J2-J3-K Model: 3He on Graphite"
    K. Seki and Y. Ohta
    J. Phys.: Conf. Ser. 200, 022056/1-4 (2010)
  4. "A New Half-Metallic Ferromagnet K2Cr8O16 Predicted by an Ab-Initio Electronic Structure Calculation"
    M. Sakamaki, T. Konishi, T. Shirakawa, and Y. Ohta
    J. Phys.: Conf. Ser. 200, 012172/1-4 (2010)

2009

  1. "Theoretical Study of the Electronic States of Hollandite Vanadate K2V8O16"
    S. Horiuchi, T. Shirakawa, and Y. Ohta
    J. Phys.: Conf. Ser. 150, 042182/1-4 (2009)
  2. "Disorder and Superconductivity in Doped Semiconductor Nanotubes"
    T. Shirakawa, S. Nishimoto, Y. Ohta, and H. Fukuyama
    J. Phys.: Conf. Ser. 150, 052238/1-4 (2009)
  3. "Antiferromagnetism and Kondo Screening in the Periodic Anderson Model: Variational Cluster Approach"
    S. Horiuchi, S. Kudo, T. Shirakawa, and Y. Ohta
    J. Phys.: Conf. Ser. 150, 042060/1-4 (2009)
  4. "Spin and Mass Excitations in the Doped Multiple Spin Exchange Model on a Triangular Lattice: 3He on Graphite"
    K. Seki, T. Shirakawa, and Y. Ohta
    J. Phys.: Conf. Ser. 150, 032095/1-4 (2009)

2008

  1. "Superconductivity in B-doped Diamonds"
    H. Fukuyama, Y. Ohta, T. Shirakawa, and S. Horiuchi
    J. Phys. Chem. Solids 69, 3265-3268 (2008)
  2. "Numerical Study on the Anisotropic Triangular-Lattice Hubbard Model at Quarter Filling: Charge Fluctuations with Three-Fold Periodicity"
    M. Shingai, S. Nishimoto, and Y. Ohta
    J. Phys. Chem. Solids 69, 3382-3384 (2008)
  3. "Variational Monte Carlo Study on Superconductivity in the Anisotropic Triangular-Lattice Hubbard Models"
    Y. Kataoka and Y. Ohta
    J. Phys. Chem. Solids 69, 3330-3333 (2008)
  4. "Theoretical Study on the Electronic States in Hollandite Vanadate K2V8O16"
    S. Horiuchi and Y. Ohta
    J. Phys. Chem. Solids 69, 3379-3381 (2008)

2007

  1. "Spin-Triplet f-Wave Pairing in the One-Dimensional Triangular-Lattice Hubbard Model: Possible Relevance to Superconductivity in Bechgaard Salts"
    Y. Ohta, S. Nishimoto, and T. Shirakawa
    Physica C 460-462, 246-247 (2007)
  2. "Spin-Triplet Superconductivity in the Hubbard Chains Coupled with Ferromagnetic Exchange Interaction"
    S. Nishimoto, T. Shirakawa, and Y. Ohta
    Physica C 460-462, 1059-1060 (2007)
  3. "B-Doped Diamond: Superconductivity without Fermi Surface"
    Y. Ohta, T. Shirakawa, S. Horiuchi, and H. Fukuyama
    Physica C 460-462, 121-124 (2007)
  4. "Spin-Triplet Superconductivity in the Double-Chain Hubbard Model with Ferromagnetic Exchange Interaction"
    T. Shirakawa, Y. Ohta, and S. Nishimoto
    J. Mag. Mag. Mater. 310, 663-665 (2007)
  5. "Spin-Triplet f-wave Suerconductivity in One-Dimensional Triangular-Lattice Hubbard Models"
    Y. Ohta, T. Shirakawa, and S. Nishimoto
    J. Mag. Mag. Mater. 310, 578-580 (2007)
  6. "Phase Separation, Spin Polarization and Triplet Superconductivity in the Hubbard Chains Coupled with Ferromagnetic Zigzag Bonds"
    S. Nishimoto, T. Shirakawa, and Y. Ohta
    J. Mag. Mag. Mater. 310, 669-671 (2007)

2006

  1. "Ring-Exchange Mechanism for Triplet Superconductivity in a Two-Chain Hubbard Model"
    Y. Ohta, S. Nishimoto, T. Shirakawa, and Y. Yamaguchi
    Physica B 378-380, 439-440 (2006)
  2. "Orbital Ordering and Spin-Singlet Formation in a Pyroxene Compound NaTiSi2O6"
    T. Shirakawa, Y. Ohta, and T. Mizokawa
    Physica B 378-380, 1056-1057 (2006)
  3. "Triplet Superconductivity in a Two-Chain Hubbard Model by the Ring-Exchange Mechanism"
    T. Shirakawa, S. Nishimoto, and Y. Ohta
    AIP Conference Proceedings Series 850, 625-626 (2006)
  4. "Orbital-Driven Spin-Singlet Formation in NaTiSi2O6"
    T. Shirakawa, Y. Ohta, and T. Mizokawa
    AIP Conference Proceedings Series 850, 1083-1084 (2006)

2003

  1. "Charge Fluctuation in the CuO Double Chains of PrBa2Cu4O8"
    Y. Ohta, R. Amasaki, and Y. Shibata
    Physica B 329-333, 1467-1468 (2003)
  2. "Anomalous Spin Excitations in a Coupled Spin-Pseudospin Model for Anisotropic Hubbard Ladders at Quarter Filling"
    Y. Ohta, S. Ejima, Y. Shibata, and T. Nakaegawa
    Physica B 329-333, 996-997 (2003)
  3. "Optical Conductivity in the CuO Double Chains of PrBa2Cu4O8"
    Y. Ohta, R. Amasaki, and Y. Shibata
    J. Low Temp. Phys. 131, 245-249 (2003)
  4. "Interplay between Spin and Charge Excitations in the Coupled Spin-Pseudospin Systems"
    Y. Ohta, S. Ejima, and T. Nakaegawa
    J. Low Temp. Phys. 131, 239-243 (2003)
  5. "Excitations in the Coupled Spin-Pseudospin Model for Quarter-Filled Ladders"
    S. Ejima, T. Nakaegawa, and Y. Ohta
    Physica B 328, 105-107 (2003)

2002

  1. "Theory of Charge and Orbital Ordering in the One-Dimensional Triangular-Lattice Vanadate BixV8O16"
    Y. Ohta and Y. Shibata
    J. Phys. Soc. Jpn. 71 (Suppl.), 181-183 (2002)

2000

  1. "Charge Dynamics of the Coupled Anisotropic t-J Ladders: A Model for α′-NaV2O5"
    S. Nishimoto and Y. Ohta
    Physica B 281-282, 646-647 (2000)
  2. "Electronic States of the Dimerized Hubbard and t-J Models for Low-Dimensional Organic Superconductors"
    S. Nishimoto and Y. Ohta
    Physica B 281-282, 953-954 (2000)

1998

  1. "Magnetism and Superconductivity of Strongly-Correlated BEDT-TTF Salts: An Exact-Diagonalization Study"
    S. Nishimoto and Y. Ohta
    J. Magn. Magn. Mater. 177-181, 505-506 (1998)

1997

  1. "Excitation Spectra of an Effective d-Wave Model for Cuprate Superconductivity"
    M. Yamaguchi, Y. Ohta, and R. Eder
    Physica C 282-287, 1733-1734 (1997)
  2. "Single-Particle Excitation Spectra of κ-(ET)2X: An Exact-Diagonalization Study"
    S. Nishimoto and Y. Ohta
    Physica C 282-287, 1911-1912 (1997)
  3. "Quasiparticle Momentum Distributions in the t-J Model"
    S. Nishimoto, R. Eder, and Y. Ohta
    Physica C 282-287, 1731-1732 (1997)
  4. "Effects of a Magnetic Field in Kondo Insulators: An Exact Diagonalization Study of the Anderson Lattice Model"
    K. Tsutsui, Y. Ohta, R. Eder, S. Maekawa, E. Dagotto, and J. Riera
    Physica B 230-232, 421-424 (1997)

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