Theory on new properties of Dirac electron system in molecular conductor

• Project/Area Number: 22540366
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Nagoya University
• Principal Investigator: KOBAYASHI Akito 名古屋大学, 理学(系)研究科(研究院), 准教授 (80335009)
• Co-Investigator(Renkei-kenkyūsha): SUZUMURA Yoshikazu 名古屋大学, 大学院理学研究科, 名誉教授 (90108449)
• Project Period (FY): 2010-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2010: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 分子性導体 / ディラック電子系 / 傾斜ディラックコーン / 分子自由度 / 電子間相互作用 / 物性理論 / 電子相関 / エキシトニック相 / 核磁気共鳴 / ディラック電子 / 磁場 / 傾斜したコーン / 強磁場

Outline of Final Research Achievements

Mechanisms of anomalous properties observed in molecular Dirac electron system were studied theoretically, and possible mechanisms of anomalous temperature dependences in resistivity and NMR experiments were proposed. In addition, new Dirac electron systems ware searched among molecular conductors, and several candidates were suggested. As a result, a new aspect in the solid state physics of Dirac electron system was developed.

Research Products

• [Journal Article] Molecular Dirac Fermion System -Theoretical and Experimental Approach- (2014)
  • Author(s): Koji Kajita, Yutaka Nishio, Naoya Tajima, Yoshikazu Suzumura, and Akito Kobayash
  • Journal Title: J. Phys. Soc. Jpn. Volume: 83 Issue: 7 Pages: 072002-072002
  • DOI: 10.7566/jpsj.83.072002
  • NAID: 210000133158
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] A Possible Massless Dirac Electron in Molecular Two-Orbital Model (2014)
  • Author(s): K. Miyahara, M. Tsuchiizu, and A. Kobayashi
  • Journal Title: JPS Conf. Proc. Volume: 3
  • DOI: 10.7566/jpscp.3.017011
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 分子性導体のディラック電子系における新物性の理論 (2014)
  • Author(s): 小林晃人、森成隆夫
  • Journal Title: 固体物理 Volume: 49 Pages: 241-251
• [Journal Article] Edge States in Molecular Solid α-(BEDT-TTF)2I3: Effects of Electron Correlations (2014)
  • Author(s): Yukiko Omori, Genki Matsuno, and Akito Kobayashi
  • Journal Title: JPS Conf. Proc. Volume: 1 Pages: 12119-12119
  • DOI: 10.7566/jpscp.1.012119
  • Peer Reviewed
• [Journal Article] Effects of Zero Line and Ferrimagnetic Fluctuation on Nuclear Magnetic Resonance for Dirac Electrons in Molecular Conductor α-(BEDT-TTF)2I3 (2013)
  • Author(s): A. Kobayashi and Y. Suzumura
  • Journal Title: J. Phys. Soc. Jpn. Volume: 82 Issue: 5 Pages: 54715-54715
  • DOI: 10.7566/jpsj.82.054715
  • NAID: 210000132562
  • Peer Reviewed
• [Journal Article] Zero-Gap State in α-(BEDT-TTF)2I3 under Hydrostatic Pressure (2013)
  • Author(s): Y. Suzumura and A. Kobayashi
  • Journal Title: J. Phys. Soc. Jpn. Volume: 82 Issue: 4 Pages: 44709-44709
  • DOI: 10.7566/jpsj.82.044709
  • NAID: 210000132522
  • Peer Reviewed
• [Journal Article] Dirac electrons in solids (2012)
  • Author(s): Hidetoshi Fukuyama, Yuki Fuseya, Masao Ogata, Akito Kobayashi, Yoshikazu Suzumura
  • Journal Title: Physica B: Condensed Matter Volume: 407 Issue: 11 Pages: 1943-1947
  • DOI: 10.1016/j.physb.2012.01.071
  • Peer Reviewed
• [Journal Article] Theory of Dirac Electrons in Organic Conductors (2012)
  • Author(s): Y. Suzumura and A. Kobayashi
  • Journal Title: Crystals Volume: 2(2) Issue: 2 Pages: 266-283
  • DOI: 10.3390/cryst2020266
  • Peer Reviewed
• [Journal Article] Zero-Gap State in Organic Conductor alpha-(BEDT-TTF)2NH4Hg(SCN)4 (2011)
  • Author(s): T.Choji, A.Kobayashi, Y.Suzumura
  • Journal Title: J.Phys.Soc.Jpn. Volume: 80 Pages: 012017-012017
  • DOI: 10.1088/1742-6596/302/1/012017
  • Peer Reviewed
• [Journal Article] Zero-Gap State in Organic Conductor alpha-(BEDT-TTF)2NH4Hg(SCN)4 (2011)
  • Author(s): T.Choji, A.Kobayashi, Y.Suzumura
  • Journal Title: J.Phys.Soc.Jpn. Volume: 80 Issue: 7 Pages: 074712-074712
  • DOI: 10.1143/jpsj.80.074712
  • Peer Reviewed
• [Journal Article] Emergence of Dirac electron pair in the charge-ordered state of theorganic conductor -(BEDT-TTF)_2I_3 (2011)
  • Author(s): A. Kobayashi, Y. Suzumura, F. Piechon, and G. Montambaux
  • Journal Title: Physical Review B Volume: 84 Issue: 7
  • DOI: 10.1103/physrevb.84.075450
  • Peer Reviewed
• [Journal Article] Berry Curvature of the Dirac Particle in alpha-(BEDT-TTF)2I3 (2011)
  • Author(s): Y.Suzumura, A.Kobayashi
  • Journal Title: Journal of Physical Society of Japan Volume: 80 Issue: 10 Pages: 104701-104701
  • DOI: 10.1143/jpsj.80.104701
  • Peer Reviewed
• [Journal Article] New Plasmon and Filtering Effect in a Pair of Tilted-Dirac Cone (2011)
  • Author(s): T.Nishine, A.Kobayashi, Y.Suzumura
  • Journal Title: Journal of Physical Society of Japan Volume: 80 Issue: 11 Pages: 114713-114713
  • DOI: 10.1143/jpsj.80.114713
  • NAID: 210000109279
  • Peer Reviewed
• [Journal Article] Role of charge fluctuation in Q1D organic superconductor (TMTSF)2ClO4 (2011)
  • Author(s): Y.Mizuno, A.Kobayashi, Y.Suzumura
  • Journal Title: Physica C Volume: 471 Pages: 49-54
  • Peer Reviewed
• [Journal Article] Tilted-Cone Induced Cusps and Nonmonotonic Structures in Dynamical Polarization Function of Massless Dirac Fermions (2010)
  • Author(s): T.Nishine, A.Kobayashi, Y.Suzumura
  • Journal Title: J.Phys.Soc.Jpn. Volume: 79
  • NAID: 40017366116
  • Peer Reviewed
• [Journal Article] Transport Currents and Persistent Currents in Solids : Orbital Magnetism and Hall Effect of Dirac Electrons (2010)
  • Author(s): H.Fukuyama, Y.Fuseya, A.Kobayashi
  • Journal Title: Perspectives of Mesoscopic Physics Pages: 69-78
  • Peer Reviewed
• [Journal Article] Effect of interactions on Dirac points in organic solids (2010)
  • Author(s): C.Hotta, A.Kobayashi
  • Journal Title: Physica B Volume: 405 Pages: 5164-5167
  • Peer Reviewed
• [Presentation] Excitonic fluctuation in tilted Dirac electron system: A possible mechanism of low-temperature anomaly in α-ET salts (2015)
  • Author(s): G. Matsuno, A. Kobayashi and H. Kohno
  • Organizer: IGER International Symposium 2015
  • Place of Presentation: Nagoya University
  • Year and Date: 2015-03-26
• [Presentation] Spin polarization induced by diamagnetic current in Rashba system (2015)
  • Author(s): Naoto Norizuki, Akito Kobayashi, and Hiroshi Kohno
  • Organizer: IGER International Symposium 2015
  • Place of Presentation: Nagoya University
  • Year and Date: 2015-03-26
• [Presentation] 非一様磁場により誘起される反磁性電流に対するスピン軌道相互作用の効果 (2015)
  • Author(s): 法月直人、小林晃人、河野浩
  • Organizer: 第70回年次大会（2015年）
  • Place of Presentation: 早稲田大学早稲田キャンパス
  • Year and Date: 2015-03-21
• [Presentation] 分子自由度を有するディラック電子系における磁場中の電子相関効果 (2015)
  • Author(s): 松野元樹、小林晃人、河野浩
  • Organizer: 第70回年次大会（2015年）
  • Place of Presentation: 早稲田大学早稲田キャンパス
  • Year and Date: 2015-03-21
• [Presentation] Effects of long-range Coulomb interaction in two-dimensional massless Dirac electron systems (2015)
  • Author(s): G. Matsuno, A. Kobayashi and H. Kohno
  • Organizer: International Workshop on Dirac Electrons in Solids
  • Place of Presentation: University of Tokyo
  • Year and Date: 2015-01-14
• [Presentation] Excitonic mass generation in Honeycomb lattice (2014)
  • Author(s): G. Matsuno, A. Kobayashi and H. Kohno
  • Organizer: Nove Quantum States in Condensed Matter 2014 (NQS2014)
  • Place of Presentation: Kyoto University
  • Year and Date: 2014-11-18
• [Presentation] 二次元ディラック電子系における低温異常と長距離クーロン相互作用 (2014)
  • Author(s): 松野元樹、小林晃人、河野浩
  • Organizer: 日本物理学会2014年秋季大会
  • Place of Presentation: 中部大学春日井キャンパス
  • Year and Date: 2014-09-09
• [Presentation] Excitonic mass generation in Dirac electron system in α-(BEDT-TTF)2I3 (2014)
  • Author(s): G. Matsuno, A. Kobayashi and H. Kohno
  • Organizer: International School and Workshop on Electronic Crystals (ECRYS-2014)
  • Place of Presentation: Cargèse, France
  • Year and Date: 2014-08-15
• [Presentation] Excitonic mass generation in Dirac electron system in an organic conductor (2014)
  • Author(s): G. Matsuno, A. Kobayashi and H. Kohno
  • Organizer: The OIST International Workshop on Novel Quantum Materials and Phases (NQMP2014)
  • Place of Presentation: 沖縄科学技術大学院大学
  • Year and Date: 2014-05-14
• [Presentation] 分子性導体のディラック電子系における電子相関効果 (2012)
  • Author(s): 小林晃人、鈴村順三
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学
  • Year and Date: 2012-03-25
• [Presentation] α型分子性導体における静水圧下でのディラック電子III (2012)
  • Author(s): 鈴村順三, 小林晃人
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学
  • Year and Date: 2012-03-25
• [Presentation] 分子性導体α-(BEDT-TTF)2I3のゼロギャップ状態における電子相関効果 (2011)
  • Author(s): 小林晃人、鈴村順三
  • Organizer: 日本物理学会2011秋季大会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-21
• [Presentation] α型分子性導体における静水圧下でのディラック電子II (2011)
  • Author(s): 鈴村順三, 小林晃人
  • Organizer: 日本物理学会2011秋季大会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-21
• [Presentation] α-(BEDT-TTF)2I3の電荷秩序相におけるディラック電子対(25pTA13) (2011)
  • Author(s): 小林晃人、鈴村順三、J.-N.Fuchs, G.Montambaux, F.Piechon
  • Organizer: 日本物理学会第66回年次大会
  • Place of Presentation: 新潟大学
  • Year and Date: 2011-03-25
• [Presentation] α型分子性導体における静水圧下でのデイラック電子(25pTA14) (2011)
  • Author(s): 鈴村順三、小林晃人
  • Organizer: 日本物理学会第66回年次大会
  • Place of Presentation: 新潟大学
  • Year and Date: 2011-03-25
• [Presentation] α-(BEDT-TTF)2NH4Hg(SCN)4のベリー曲率とディラック電子(25pTA15) (2011)
  • Author(s): 丁子丈士、小林晃人、鈴村順三
  • Organizer: 日本物理学会第66回年次大会
  • Place of Presentation: 新潟大学
  • Year and Date: 2011-03-25
• [Presentation] α-(BEDT-TTF)2I3の電荷秩序相におけるディラック電子対のMerging (25aRB-11) (2010)
  • Author(s): 小林晃人、鈴村順三、J.-N.Fuchs, G.Montambaux, F.Piechon
  • Organizer: 日本物理学会2010年秋季大会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2010-09-25
• [Presentation] α-(BEDT-TTF)2I3のゼロギャップ状態近傍のデイラック電子のベリー曲率(25aRB-12) (2010)
  • Author(s): 鈴村順三、小林晃人、J.-N.Fuchs, G.Montambaux, F.Piechon
  • Organizer: 日本物理学会2010年秋季大会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2010-09-25
• [Presentation] Dielectric Properties in the Zero-Gap Organic Conductor alpha-(BEDT-TTF)_2I_3 (2010)
  • Author(s): T.Nishine, A.Kobayashi, Y.Suzumura
  • Organizer: International Conference on Science and Technology of Synthetic Metals (ICSM 2010)
  • Place of Presentation: 京都国際会議場
  • Year and Date: 2010-07-06
• [Presentation] Electron correlation effects in Dirac electron system in α-(BEDT-TTF)2I3
  • Author(s): G. Matsuno, A. Kobayashi
  • Organizer: IGER International Symposium on Science of Molecular Assembly and Biomolecular Systems 2014
  • Place of Presentation: Nagoya University
• [Presentation] Orbital Magnetism and Valley Hall Effect in Two-Dimensional Electron System with Tilted Dirac Cones
  • Author(s): Akito Kobayashi and Takaaki Eguchi
  • Organizer: SCES’13
  • Place of Presentation: The University of Tokyo
• [Presentation] Possible Massless Dirac Electron in Molecular Two-Orbital Model
  • Author(s): K. Miyahara, M. Tsuchiizu, and A. Kobayashi
  • Organizer: SCES'13
  • Place of Presentation: The University of Tokyo
• [Presentation] Klein Tunneling and Bound States on the Potential Barrier in Two-Dimensional Electron System with Tilted Dirac Cones
  • Author(s): G. Matsuno, T. Tsumura, and A. Kobayashi
  • Organizer: SCES'13
  • Place of Presentation: The University of Tokyo
• [Presentation] Edge states in Molecular Solid α-(BEDT-TTF)2I3: Effects of Electron Correlations
  • Author(s): Yukiko Omori, Genki Matsuno, Akito Kobayashi
  • Organizer: the 12th Asia Pacific Physics Conference
  • Place of Presentation: Chiba, Japan
• [Presentation] 分子二軌道系における新規ディラック電子の可能性とエッジ状態
  • Author(s): 宮原和之、土射津昌久、小林晃人
  • Organizer: 固体中におけるディラック電子系物理の新展開
  • Place of Presentation: 京都大学基礎物理学研究所
• [Presentation] 傾斜ディラックコーンをもつ2 次元電子系におけるエッジ状態と束縛状態、およびクライン・トンネリング
  • Author(s): 松野元樹、津村卓弥、小林晃人
  • Organizer: 固体中におけるディラック電子系物理の新展開
  • Place of Presentation: 京都大学基礎物理学研究所
• [Presentation] α-(BEDT-TTF)2I3のディラック電子系 におけるバレーホール効果
  • Author(s): 小林晃人、松野元樹
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学
• [Presentation] 分子性導体のディラック電子系における光誘起ギャップの効果
  • Author(s): 宮原和之、小林晃人
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学
• [Presentation] α-(BEDT-TTF)2I3のディラック電子系における電荷秩序と熱電効果
  • Author(s): 松野元樹、小林晃人
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学
• [Presentation] ディラックコーンのマージングと円偏光照射効果
  • Author(s): 宮原和之、小林晃人
  • Organizer: 「固体中のディラック電子」研究会
  • Place of Presentation: 兵庫
• [Presentation] 分子性導体のディラック電子系における円偏光照射の効果
  • Author(s): 宮原和之、小林晃人
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 東海大学
• [Presentation] α-(BEDT-TTF)2I3 のディラック電子系における電子相関効果
  • Author(s): 松野元樹、小林晃人
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 東海大学
• [Presentation] α型BEDT-TTF塩のDirac電子系における次近接相互作用の効果
  • Author(s): 大森有希子、小林晃人
  • Organizer: 日本物理学会2012年秋季大会
  • Place of Presentation: 横浜国立大学常盤台キャンパス
• [Presentation] 分子多軌道模型における新規ディラック電子の可能性
  • Author(s): 宮原和之、土射津昌久、小林晃人
  • Organizer: 日本物理学会2012年秋季大会
  • Place of Presentation: 横浜国立大学常盤台キャンパス
• [Remarks] 小林晃人のホームページ
  • URL: http://www.slab.phys.nagoya-u.ac.jp/akito/
• [Remarks] S研へようこそ！－名古屋大学 物性理論研究室
  • URL: http://www.s.phys.nagoya-u.ac.jp/ja
• [Remarks] 小林晃人のホームページ
  • URL: http://www.slab.phys.nagoya-u.ac.jp/akito/
• [Remarks] 小林晃人のホームページ
  • URL: http://www.slab.phys.nagoya-u.ac.jp/akito/
• [Remarks]
  • URL: http://www.slab.phys.nagoya-u.ac.jp/akito/
• [Remarks] 和文学術雑誌記事:小林晃人、擬スピン強磁性とKT転移(理論)、固体物理Vol.45 No.11(2010)147-154.