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Strongly correlated electron physics emerging from doublon degrees of freedom in fullerides

Research Project

Project/Area Number 21K03459
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
Research InstitutionSaitama University

Principal Investigator

Hoshino Shintaro  埼玉大学, 理工学研究科, 助教 (90748394)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywordsフラーレン / 超伝導 / 強相関電子系 / 多軌道系 / エリアシュベルク理論 / モット絶縁体 / 運動方程式 / 分子軌道 / ダブロン
Outline of Research at the Start

アルカリ金属をドープしたフラーレン結晶は分子軌道自由度を持つ強相関電子系のひとつであり、電子間相互作用による興味深い現象を生み出している。この系では分子軌道を電子が2重占有した状態(ダブロン)が重要な役割を果たすことが指摘されており、その自由度は通常電子とは定性的に異なる新奇な物性を示す可能性を秘めている。本研究では、現実物質を念頭に置いた電子系を様々な角度から解析し、ダブロンが生み出す新規物性を開拓する。

Outline of Final Research Achievements

In solids at temperatures below room temperature, the internal degrees of freedom of electrons (charge, spin, and orbital) are entangled, leading to fascinating cooperative phenomena. The focus of this study is on fullerene compounds with orbital degrees of freedom. Based on quantum statistical mechanics, we elucidate the unique electronic states induced by the peculiar interactions among electrons in fullerenes. Furthermore, we extend the theoretical methods developed here to be applicable to general classes of materials with multi-orbital electron systems.

Academic Significance and Societal Importance of the Research Achievements

フラーレン物質に代表される強相関電子系では、電子そのものではなく、相互作用によって電子同士が結合した複合体が発現し、これに起因して様々な興味深い現象が引き起こされる。このような物理は、通常の電子に由来する現象とは質的に異なるものであり、新しい電子物性・機能の開拓につながる可能性がある。さらに、本研究で構築した理論枠組みは他の物質にも適用できるため、今後、この手法を一般の物質群に応用して新規現象を探索することができる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (24 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (2 results) Journal Article (7 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 7 results) Presentation (12 results) (of which Int'l Joint Research: 5 results,  Invited: 4 results) Remarks (3 results)

  • [Int'l Joint Research] University of Fribourg(スイス)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] University of Fribourg(スイス)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Impurity effect on Bogoliubov Fermi surfaces: Analysis based on iron-based superconductors2024

    • Author(s)
      Miki Tatsuya、Ikeda Hiroaki、Hoshino Shintaro
    • Journal Title

      Physical Review B

      Volume: 109 Issue: 9 Pages: 094502-094502

    • DOI

      10.1103/physrevb.109.094502

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Material-based analysis of spin-orbital Mott insulators2023

    • Author(s)
      Iwazaki Ryuta、Shinaoka Hiroshi、Hoshino Shintaro
    • Journal Title

      Physical Review B

      Volume: 108 Issue: 24 Pages: 1-7

    • DOI

      10.1103/physrevb.108.l241108

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Eta-pairing on square and triangular lattices2023

    • Author(s)
      Misu Yutaro、Tamura Shun、Tanaka Yukio、Hoshino Shintaro
    • Journal Title

      Physical Review B

      Volume: 107 Issue: 18 Pages: 1-11

    • DOI

      10.1103/physrevb.107.184512

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spin-Derived Electric Polarization and Chirality Density Inherent in Localized Electron Orbitals2023

    • Author(s)
      Hoshino Shintaro、Suzuki Michi-To、Ikeda Hiroaki
    • Journal Title

      Physical Review Letters

      Volume: 130 Issue: 25 Pages: 1-6

    • DOI

      10.1103/physrevlett.130.256801

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Eliashberg theory of the Jahn-Teller-Hubbard model2022

    • Author(s)
      Y. Kaga, P. Werner, S. Hoshino
    • Journal Title

      Physical Review B

      Volume: 105 Issue: 21

    • DOI

      10.1103/physrevb.105.214516

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Spin-orbital model for fullerides2021

    • Author(s)
      Iwazaki Ryuta、Hoshino Shintaro
    • Journal Title

      Physical Review B

      Volume: 103 Issue: 23

    • DOI

      10.1103/physrevb.103.235145

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Multipolar ordering in the three-orbital Hubbard model2021

    • Author(s)
      Chikano Naoya、Hoshino Shintaro、Shinaoka Hiroshi
    • Journal Title

      Physical Review B

      Volume: 104 Issue: 23

    • DOI

      10.1103/physrevb.104.235125

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Relativistic corrections in strongly correlated electron systems2024

    • Author(s)
      Shintaro Hoshino
    • Organizer
      Second Workshop on Fundamentals in density functional theory (DFT2024)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 電子・フォノン結合を用いたモット絶縁体に対する拡張LLG方程式の導出2024

    • Author(s)
      星野晋太郎、Rico Pole, 求幸年
    • Organizer
      日本物理学会春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 局在電子軌道における電気分極とカイラリティ2023

    • Author(s)
      星野 晋太郎
    • Organizer
      研究会「強相関電子系のフロンティア」
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 電子系におけるカイラリティと電磁場の結合2023

    • Author(s)
      星野晋太郎、三木健矢、鈴木通人、池田浩章
    • Organizer
      日本物理学会年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Spin-orbital dynamics of localized electrons2023

    • Author(s)
      Shintaro Hoshino
    • Organizer
      Computational Approaches to Quantum Many-Body Systems
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 小研究会「物性科学における電子カイラリティ密度の理論」2023

    • Author(s)
      星野晋太郎
    • Organizer
      物性物理における相対論補正
    • Related Report
      2023 Annual Research Report
  • [Presentation] 局在多軌道電子系におけるモンテカルロ解析2022

    • Author(s)
      星野晋太郎、岩崎龍太、品岡寛
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Spin-orbital dynamics of localized electrons2022

    • Author(s)
      Shintaro Hoshino
    • Organizer
      Trends in the Theory of Quantum Materials 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Microscopic theory of fulleride superconductors2022

    • Author(s)
      Shintaro Hoshino
    • Organizer
      International workshop on Physics and Chemistry
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Spin-orbital model for fullerides2021

    • Author(s)
      R. Iwazaki and S. Hoshino
    • Organizer
      International Conference on Quantum Liquid Crystals 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] パイロクロア酸化物の多軌道電子系に対する強相関極限解析2021

    • Author(s)
      岩﨑龍太、近野直也、品岡寛、星野晋太郎
    • Organizer
      日本物理学会2021 年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] パイロクロア酸化物に対する局在電子系のスピン・ 軌道相関2021

    • Author(s)
      岩﨑龍太、近野直也、品岡寛、星野晋太郎
    • Organizer
      日本物理学会第77 回年次大会
    • Related Report
      2021 Research-status Report
  • [Remarks] 量子物性理論研究室

    • URL

      https://phy.saitama-u.ac.jp/~hoshino/

    • Related Report
      2023 Annual Research Report
  • [Remarks] http://www.phy.saitama-u.ac.jp/~hoshino/

    • Related Report
      2022 Research-status Report
  • [Remarks] 量子物性理論研究室

    • URL

      http://www.phy.saitama-u.ac.jp/~hoshino/

    • Related Report
      2021 Research-status Report

URL: 

Published: 2021-04-28   Modified: 2025-01-30  

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