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Theoretical study on the magnetism and novel superconductivity in the carrier-doped Hubbard model on the honeycomb lattice

Research Project

Project/Area Number 16K17754
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Condensed matter physics II
Research InstitutionKanagawa University

Principal Investigator

Aizawa Hirohito  神奈川大学, 工学部, 助教 (90586231)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords電子相関 / 磁性 / 超伝導 / キャリアドープ / 強相関電子系 / ハニカム格子 / 擬一次元系 / 擬二次元系 / 物性物理 / 物性理論
Outline of Final Research Achievements

In this project, we investigate an effect of carrier doping on the magnetism and novel superconductivity in the Hubbard model on the honeycomb lattice having a characteristic band structure. In magnetic properties, we evaluated a critical Coulomb interaction of the magnetic transition at the ground state and clarified a magnetic phase diagram on a temperature and interaction space. In a novel superconductivity, the pairing competition was confirmed by carrier doping to the honeycomb lattice from Dirac point to van Hove singularity. In addition to that, we clarified the superconducting state in actual materials which have a characteristic band structure.

Academic Significance and Societal Importance of the Research Achievements

電子の遍歴性(電子の移動しやすさ)と局在性(電子間斥力による移動しにくさ)が拮抗した強相関電子系での現象の理解は物性物理学の重要な課題の一つであり、キャリア数と格子数の比は重要となる。本研究では、そのような系としてハニカム格子ハバード模型に注目し、キャリア・ドープの影響が磁性と新奇超伝導に及ぼす影響を調べた。本研究成果の意義は、通常より大きなサイズでの磁気転移臨界相互作用の評価と相互作用に対する有限温度の磁気相図を明らかにしたことが挙げられる。超伝導研究での意義は、キャリア・ドープで新奇超伝導が増強し得ることを示し、さらに現実の物質で新奇超伝導の可能性を検証したことが挙げられる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (10 results)

All 2018 2017 2016

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (7 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Electronic Structure Calculation and Superconductivity in λ-(BETS)2GaCl42018

    • Author(s)
      Aizawa Hirohito、Koretsune Takashi、Kuroki Kazuhiko、Seo Hitoshi
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 87 Issue: 9 Pages: 093701-093701

    • DOI

      10.7566/jpsj.87.093701

    • NAID

      210000134936

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Microscopic theory of the superconducting gap in the quasi-one-dimensional organic conductor (TMTSF)2ClO4: Model derivation and two-particle self-consistent analysis2018

    • Author(s)
      Hirohito Aizawa, and Kazuhiko Kuroki
    • Journal Title

      Physical Review B

      Volume: 97 Issue: 10

    • DOI

      10.1103/physrevb.97.104507

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Phase diagram of the magnetic state obtained from a two-particle self-consistent analysis of the half-filled Hubbard model on a honeycomb lattice2018

    • Author(s)
      Hirohito Aizawa
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 969 Pages: 012095-012095

    • DOI

      10.1088/1742-6596/969/1/012095

    • Related Report
      2018 Annual Research Report 2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Electronic Band Structure and Anisotropy of Superconducting Gap in Molecular Conductor λ-(BETS)2GaCl42018

    • Author(s)
      H. Aizawa, T. Koretsune, K. Kuroki and H. Seo
    • Organizer
      4th International Conference on Functional Materials Science 2018 (ICFMS 2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Electronic Band Structure and Superconducting Gap Symmetry in Organic Conductor λ-(BETS)2GaCl42018

    • Author(s)
      H. Aizawa, T. Koretsune, K. Kuroki and H. Seo
    • Organizer
      12th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (M2S-2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 有機導体λ-(BETS)2GaCl4のスピン揺らぎ媒介による超伝導ギャップの異方性Ⅱ2018

    • Author(s)
      相澤啓仁, 是常隆, 黒木和彦, 妹尾仁嗣
    • Organizer
      日本物理学会 2018年秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] ハニカム格子ハバード模型における磁気相図と超伝導に関する二体自己無撞着法による解析2017

    • Author(s)
      相澤啓仁
    • Organizer
      日本物理学会 第72回年次大会
    • Place of Presentation
      大阪大学豊中キャンパス(大阪府)
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] Two-particle self-consistent analysis for the magnetism and superconductivity in the honeycomb lattice Hubbard model2017

    • Author(s)
      Hirohito Aizawa
    • Organizer
      28th international conference on Low Temperature Physics (LT28)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] ハニカム格子ハバード模型におけるキャリアドープが磁性と超伝導に与える影響2016

    • Author(s)
      相澤啓仁
    • Organizer
      第10回 物性科学領域横断研究会 -凝縮系科学の最前線-
    • Place of Presentation
      神戸大学六甲台第2キャンパス(兵庫県)
    • Year and Date
      2016-12-09
    • Related Report
      2016 Research-status Report
  • [Presentation] ハニカム格子ハバード模型におけるキャリアドープが引き起こす磁性と超伝導の二体自己無撞着法による解析2016

    • Author(s)
      相澤啓仁
    • Organizer
      京都大学基礎物理学研究所研究会「超伝導研究の最先端: 多自由度、非平衡、電子相関、トポロジー」
    • Place of Presentation
      京都大学湯川記念館(京都府)
    • Year and Date
      2016-10-10
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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