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Mechanims of quantum liquid crysital states in strongly correlated electron systems

Research Project

Project/Area Number 18H01175
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
Research InstitutionNagoya University

Principal Investigator

Kontani Hiroshi  名古屋大学, 理学研究科, 教授 (90272533)

Co-Investigator(Kenkyū-buntansha) 土射津 昌久  奈良女子大学, 自然科学系, 准教授 (70362225)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2020: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2019: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
Fiscal Year 2018: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywords量子干渉機構 / 鉄系超伝導体 / カゴメ金属 / 銅酸化物高温超伝導体 / ネマティック秩序 / バーテックス補正 / 量子干渉効果 / 非従来型超伝導 / 銅酸化物超伝導体 / 汎関数繰り込み群 / スメクティック秩序 / 強相関電子系 / 非従来型超伝送 / 多極子揺らぎ理論 / 重い電子系
Outline of Final Research Achievements

In strongly correlated electron systems, rich variety of quantum phase transitions has been discovered in the last decade, such as the nematic and smectic orders with broken rotational symmetry and the current orders with spontaneous spin- or charge-currents. To understand the origin of these transitions microscopically, the applicant has developed (1) the density-wave equation theory, which is equivalent to the extreme value condition of the thermodynamic potential, and (2) the derivation of optimized order parameter based on the functional renormalization group theory. Based on these theories, we explained the following novel quantum phase transitions. (a) Microscopic mechanism of "Davidian order" and superconducting state realized in kagome metal AV3Sb5. (b) Nematic ordering in twisted bilayer graphene and (c) Smectic order in iron-based superconductors. (d) Microscopic mechanism of current order in frustrated metals.

Academic Significance and Societal Importance of the Research Achievements

強相関電子系における多彩な量子相転移の研究は、実験技術の急速な進歩により爆発的に進展した一方で、単純な平均場近似では理解不可能であるため、理論の発展が急務であった。申請者の理論(密度波方程式理論および汎関数くりこみ群理論)により、平均場近似を超えた量子相転移の解析が可能になり、実験事実の解析や理論的予言が可能になったことは大変意義深い。
本理論を具体的物質に適用し、カゴメ金属AV3Sb5のダビデ星型秩序および超伝導発現機構の特定、ねじれ2層グラフェンのネマティック秩序や鉄系超伝導体のスメクティック秩序の機構解明など、多岐に渡る量子液晶の研究を遂行し、当該分野の理論研究の指導的役割を果たした。

Report

(4 results)
  • 2022 Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (29 results)

All 2023 2022 2020 2019 2018 Other

All Journal Article (13 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 13 results,  Open Access: 1 results) Presentation (12 results) (of which Int'l Joint Research: 10 results,  Invited: 6 results) Remarks (4 results)

  • [Journal Article] Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems2023

    • Author(s)
      Kontani Hiroshi、Tazai Rina、Yamakawa Youichi、Onari Seiichiro
    • Journal Title

      Advances in Physics

      Volume: 70 Issue: 3 Pages: 355-443

    • DOI

      10.1080/00018732.2022.2144590

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A Rigorous Formalism of Unconventional Symmetry Breaking in Fermi Liquid Theory and Its Application to Nematicity in FeSe2023

    • Author(s)
      Rina Tazai, Shun Matsubara, Youichi Yamakawa, Seiichiro Onari, and Hiroshi Kontani
    • Journal Title

      Physical Review B

      Volume: 107 Issue: 3 Pages: 035137-035137

    • DOI

      10.1103/physrevb.107.035137

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Correlation-driven electronic nematicity in the Dirac semimetal BaNiS22022

    • Author(s)
      Christopher John Butler, Yuhki Kohsaka, Youichi Yamakawa, Mohammad Saeed Bahramy, Seiichiro Onari, Hiroshi Kontani, Tetsuo Hanaguri, and Shinichi Shamoto
    • Journal Title

      Proceedings of the National Academy of Sciences of the United States of America

      Volume: 119 Issue: 49

    • DOI

      10.1073/pnas.2212730119

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Diverse Exotic Orders and Fermiology in Fe-Based Superconductors: A Unified Mechanism for B1g/B2g Nematicity in FeSe/(Cs,Rb)Fe2As2 and Smectic Order in BaFe2As22022

    • Author(s)
      Seiichiro Onari and Hiroshi Kontani
    • Journal Title

      Frontiers in Physics

      Volume: 10 Pages: 915619-915619

    • DOI

      10.3389/fphy.2022.915619

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Emergence of strongly correlated electronic states driven by the Andreev bound state in d-wave superconductors2020

    • Author(s)
      Matsubara Shun、Kontani Hiroshi
    • Journal Title

      Physical Review B

      Volume: 101 Issue: 7 Pages: 075114-075114

    • DOI

      10.1103/physrevb.101.075114

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Hexadecapole Fluctuation Mechanism for s-wave Heavy Fermion Superconductor CeCu2Si2: Interplay between Intra- and Inter-Orbital Cooper Pairs2019

    • Author(s)
      Tazai Rina、Kontani Hiroshi
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 88 Issue: 6 Pages: 063701-063701

    • DOI

      10.7566/jpsj.88.063701

    • NAID

      40021915114

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pressure-induced quantum critical point in the heavily hydrogen-doped iron-based superconductor LaFeAsO2019

    • Author(s)
      Takeuchi Masayoshi、Fujiwara Naoki、Kuwayama Takanori、Nakagawa Satoshi、Iimura Soshi、Matsuishi Satoru、Yamakawa Youichi、Kontani Hiroshi、Hosono Hideo
    • Journal Title

      Physical Review B

      Volume: 99 Issue: 17 Pages: 174517-174517

    • DOI

      10.1103/physrevb.99.174517

    • NAID

      120006636656

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Origin of diverse nematic orders in Fe-based superconductors: 45° rotated nematicity in AFe2As2(A=Cs,Rb)2019

    • Author(s)
      Onari Seiichiro、Kontani Hiroshi
    • Journal Title

      Physical Review B Rapid Communication

      Volume: 100 Issue: 2 Pages: 020507-020507

    • DOI

      10.1103/physrevb.100.020507

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Multipole fluctuation theory forheavy fermion systems: Application to multipole orders in CeB62019

    • Author(s)
      Rina Tazai, Hiroshi Kontani
    • Journal Title

      Phys. Rev. B

      Volume: 100 Issue: 24 Pages: 241103-241103

    • DOI

      10.1103/physrevb.100.241103

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Self-energy driven resonancelike inelastic neutron spectrum in the s++-wave state in Fe-based superconductors2018

    • Author(s)
      L. Takeuchi, Y. Yamakawa, and H. Kontani
    • Journal Title

      Physical Review B

      Volume: 98 Issue: 16 Pages: 1-11

    • DOI

      10.1103/physrevb.98.165143

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Edge-induced Strongly Correlated Electronic States in Two-dimensional Hubbard Model: Enhancement of Magnetic Correlations and Self-energy Effects2018

    • Author(s)
      S. Matsubara, Y. Yamakawa, and H. Kontani
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 87 Issue: 7 Pages: 073705-073705

    • DOI

      10.7566/jpsj.87.073705

    • NAID

      210000134884

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pairing mechanism for nodal s-wave superconductivity in BaFe2(As,P)2: Analysis beyond Migdal-Eliashberg formalism2018

    • Author(s)
      H. Nakaoka, Y. Yamakawa, and H. Kontani
    • Journal Title

      Physical Review B

      Volume: 98 Issue: 12 Pages: 1-12

    • DOI

      10.1103/physrevb.98.125107

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fully gapped s-wave superconductivity enhanced by magnetic criticality in heavy-fermion systems2018

    • Author(s)
      Tazai Rina、Kontani Hiroshi
    • Journal Title

      Physical Review B

      Volume: 98 Issue: 20 Pages: 1-15

    • DOI

      10.1103/physrevb.98.205107

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] Mechanism of even- and odd-parity density-waves and beyond-Migdal superconductivity in kagome metal AV3Sb5 (A = K, Rb, Cs)2023

    • Author(s)
      H. Kontani
    • Organizer
      APS March Meeting 2023
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Exotic density-wave states and superconductivity in kagome metals and other strongly correlated electron systems2022

    • Author(s)
      H. Kontani
    • Organizer
      Superstripes 2022
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 多軌道金属における内因性ホール効果:軌道流とスピン流の関係性2022

    • Author(s)
      H. Kontani
    • Organizer
      第85回スピントロニクス専門研究会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Exotic density-wave states and superconductivity in kagome metals and other strongly correlated electron systems2022

    • Author(s)
      H. Kontani
    • Organizer
      Novel Quantum States in Condensed Matter 2022
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Nematicity, pairing mechanism and spin resonance in Fe-based SCs2019

    • Author(s)
      H. Kontani
    • Organizer
      Spectroscopies in Novel Superconductors ‘(SNS2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Mechanism of diverse nematicity and fully-gapped s-wave superconductivity in heavy fermion CeCu2Si2 and Fe-based superconductor2019

    • Author(s)
      H. Kontani
    • Organizer
      SUPERSTRIPES 2019, Ischia (Naples), Italy
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Origin of Diverse Nematicity in Fe-based superconductors: B2g bond order in AFe2As2(A=Cs, Rb) and antiferro-nematic order in Ba122 compounds2019

    • Author(s)
      H. Kontani
    • Organizer
      International Conference on Strongly Correlated Electron Systems (SCES2019), Okayama
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Unconventional density waves and novel pairing mechanism in strongly correlated electron systems2019

    • Author(s)
      H. Kontani
    • Organizer
      ELECTRON CORRELATION IN SUPERCONDUCTORS AND NANOSTRUCTURES (ECSN-2019) , ODESSA , UKRAINE
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Origin of diverse nematic orders in Fe-based superconductors: 45 degree rotated nematicity in AFe2As2 (A=Cs, Rb)2019

    • Author(s)
      紺谷浩
    • Organizer
      APS March meeting
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin fluctuation driven nematicity in Fe-based and high-Tc superconductors superconductors2019

    • Author(s)
      紺谷浩
    • Organizer
      6th International Conference On Superconductivity & Magnetism
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Diverse nematicity and superconductivity in high-Tc superconductors superconductors2018

    • Author(s)
      紺谷浩
    • Organizer
      the 12th International Conference on Materials and Mechanisms of Superconductivity (M2S 2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 各種高温超伝導体におけるネマティック秩序2018

    • Author(s)
      紺谷浩
    • Organizer
      高温超伝導フォーラム(第6回)
    • Related Report
      2018 Annual Research Report
  • [Remarks] S研 凝縮系理論グループ(Sc)へようこそ

    • URL

      http://www.s.phys.nagoya-u.ac.jp/

    • Related Report
      2020 Annual Research Report
  • [Remarks] Sc研究室・研究業績・出版論文

    • URL

      http://www.s.phys.nagoya-u.ac.jp/publication/index.html

    • Related Report
      2019 Annual Research Report
  • [Remarks] Sc研 出版論文

    • URL

      http://www.s.phys.nagoya-u.ac.jp/publication

    • Related Report
      2018 Annual Research Report
  • [Remarks] Sc研 学会・研究会・受賞等

    • URL

      http://www.s.phys.nagoya-u.ac.jp/publication/talks

    • Related Report
      2018 Annual Research Report

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Published: 2018-04-23   Modified: 2024-01-30  

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