Theory for novel nonequilibrium phenomena in strongly correlated electron systems

• Project/Area Number: 24740244
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Chuo University (2013-2014); Institute for Molecular Science (2012)
• Principal Investigator: TANAKA Yasuhiro 中央大学, 理工学部, 助教 (50541801)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: 非線形伝導 / 電流電圧特性 / 負性微分抵抗 / 絶縁破壊 / 非平衡グリーン関数 / 非平衡状態 / 電荷秩序 / 有機導体

Outline of Final Research Achievements

Current-voltage characteristics in insulators attached to metallic electrodes have been studied theoretically. For an organic conductor beta-(meso-DMBEDT-TTF)2PF6, which exhibits an insulating state with charge order, I have investigated how the applied bias destroys the charge-ordered insulator when the current flows. I found that a novel bias-induced conductive state in which the charge-order remain finite. I also clarified conditions for the appearance of negative differential resistance in systems with electrodes by studying a simplified model exactly.

Research Products

• [Journal Article] Roles of Potential Gradient and Electrode Bandwidth on Negative Differential Resistance in One-Dimensional Band Insulator (2014)
  • Author(s): Y. Tanaka and K. Yonemitsu
  • Journal Title: J. Phys. Soc. Jpn. Volume: 83 Issue: 12 Pages: 1247041-4
  • DOI: 10.7566/jpsj.83.124704
  • NAID: 40020299851
  • Peer Reviewed
• [Journal Article] Optical freezing of charge motion in an organic conductor (2014)
  • Author(s): T. Ishikawa, Y. Sagae, Y. Naitoh, Y. Kawakami, H. Itoh, K. Yamamoto, K. Yakushi, H. Kishida, T. Sasaki, S. Ishihara, Y. Tanaka, K. Yonemitsu and S. Iwai
  • Journal Title: Nature Communications Volume: 5 Issue: 1 Pages: 5528-5528
  • DOI: 10.1038/ncomms6528
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Charge Order and Possible Bias-Induced Metastable State in Organic Conductor β-(meso-DMBEDT-TTF)2PF6: Effects of Structural Distortion (2013)
  • Author(s): Y. Tanaka and K. Yonemitsu
  • Journal Title: J. Phys.: Condens. Matter Volume: 25 Issue: 46 Pages: 465603-465603
  • DOI: 10.1088/0953-8984/25/46/465603
  • Peer Reviewed
• [Journal Article] Current-Voltage Characteristics and Breakdown Mechanism in One-Dimensional Band and Mott Insulators Attached to Electrodes (2013)
  • Author(s): Y. Tanaka and K. Yonemitsu
  • Journal Title: J. Kor. Phys. Soc. Volume: 62 Issue: 12 Pages: 2164-2167
  • DOI: 10.3938/jkps.62.2164
  • Peer Reviewed
• [Presentation] 電極に繋がれたバンド絶縁体における負性微分抵抗の起源について (2015)
  • Author(s): 田中康寛、米満賢治
  • Organizer: 日本物理学会
  • Place of Presentation: 早稲田大学(東京都)
  • Year and Date: 2015-03-21 – 2015-03-24
• [Presentation] 有機導体における電子相関効果および非線形伝導について (2015)
  • Author(s): 田中康寛
  • Organizer: 第一回計算分子科学の若手理論研究会
  • Place of Presentation: 湯涌温泉(石川県)
  • Year and Date: 2015-03-03 – 2015-03-04
• [Presentation] Effects of electron correlation in organic conductor alpha-(BEDT-TTF)2I3 (2014)
  • Author(s): Y. Tanaka
  • Organizer: Gordon Research Conference on Conductivity and Magnetism in Molecular Materials
  • Place of Presentation: ベイツ大学(アメリカ)
  • Year and Date: 2014-08-03 – 2014-08-08
• [Presentation] 有機導体α-(BEDT-TTF)2I3における電子相関効果 (2014)
  • Author(s): 田中康寛
  • Organizer: 日本物理学会
  • Place of Presentation: 東海大学(神奈川県)
• [Presentation] 有機導体α-(BEDT-TTF)2I3の基底状態における電子相関効果 (2013)
  • Author(s): 田中康寛
  • Organizer: 日本物理学会
  • Place of Presentation: 徳島大学(徳島県)
• [Presentation] 有機導体α-(BEDT-TTF)2I3における電子相関効果 (2013)
  • Author(s): 田中康寛
  • Organizer: 第３回 強相関電子系理論の最前線 -若手によるオープンイノベーション -
  • Place of Presentation: 那智勝浦(和歌山県)
  • Invited
• [Presentation] 有機導体α-(ET)2I3における電子相関効果 (2013)
  • Author(s): 田中康寛
  • Organizer: 日本物理学科
  • Place of Presentation: 広島大学(広島県)
• [Presentation] 二次元有機導体における電場による電荷秩序の融解と非線形伝導 (2012)
  • Author(s): 田中康寛、米満賢治
  • Organizer: 日本物理学会
  • Place of Presentation: 横浜国立大学(神奈川県)
• [Presentation] Nonequilibrium states and I-V characteristics in one-dimensional band and Mott insulators attached to electrodes (2012)
  • Author(s): Y. Tanaka and K. Yonemitsu
  • Organizer: International conference on Magnetism with Strongly Correlated Electron Systems
  • Place of Presentation: 韓国、釜山
• [Presentation] Nonlinear conduction by melting of charge order in quasi-two-dimensional organic conductors (2012)
  • Author(s): Y. Tanaka and K. Yonemitsu
  • Organizer: International conference on Electronic States and Phases Induced by Electric or Optical Impacts
  • Place of Presentation: フランス、オルセー
• [Presentation] Checkerboad Charge Order and Nonlinear Conduction in beta-(meso-DMBEDT-TTF)2PF6 (2012)
  • Author(s): Y. Tanaka and K. Yonemitsu
  • Organizer: International Symposium on Material Science Opened by Molecular Degree of Freedom
  • Place of Presentation: 宮崎シーガイア(宮崎県)
• [Presentation] 有機導体β-(meso-DMBEDT-TTF)2PF6における電荷秩序と非線形伝導 (2012)
  • Author(s): 田中康寛
  • Organizer: 第二回 強相関電子系理論の最前線 -若手によるオープンイノベーション-
  • Place of Presentation: 那智勝浦(和歌山県)
  • Invited