Research of higher-order multipole phase, nematic phase, and exotic superconductivity based on modern multipole theory

• Project Area: Physical Properties of Quantum Liquid Crystals
• Project/Area Number: 20H05159
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Kyoto University
• Principal Investigator: 柳瀬 陽一 京都大学, 理学研究科, 教授 (70332575)
• Project Period (FY): 2020-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000); Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 超伝導ダイオード効果 / スピン三重項超伝導 / アナポール超伝導 / 超伝導量子幾何学 / 多極子 / 超伝導 / ネマティック秩序 / 光学応答 / 電気四極子モーメント / 圧電効果 / 多極子揺らぎ / アナポール秩序 / 非線形光学応答 / ネマティック相 / エキゾチック超伝導

Outline of Research at the Start

現代の物性物理学においては、量子多体系が有する豊富な対称性とその自発的破れに対する理解が特段に重要な課題となっている。応募者はエキゾチック超伝導や多極子秩序系に関する多数の研究成果を活用し、現代的な多極子理論による高次多極子／ネマティック相とエキゾチック超伝導の包括的な研究を行う。幅広い多極子・ネマティック物質やエキゾチック超伝導体を研究対象として提案し、実験グループと協力して研究を推進する。

Outline of Annual Research Achievements

2020年に実験グループと共同で発表した超伝導ダイオード効果の内因的メカニズムを解明し、内因的超伝導ダイオード効果と名付けた。超伝導ダイオード効果とは、臨界電流の非相反性により、ある方向に電流を流した場合には電気抵抗ゼロであり逆方向に流した場合には電気抵抗が有限となる現象である。内因的超伝導ダイオード効果では、クーパー対の重心運動量と密接に関係したメカニズムによりダイオード効果が起こる。本研究課題では、ギンツブルグランダウ理論とBCS理論を併用して、ラシュバ超伝導体における内因的超伝導ダイオード効果の磁場温度相図を決定した。その結果、クーパー対の重心運動量が急激に増加するクロスオーバー現象に伴って、超伝導ダイオード効果が符号反転を起こすことを示した。この結果により、空間反転対称性が欠如した結晶に特有のエキゾチック超伝導相であるヘリカル超伝導相を実験的に検出する方法が見出された。
また、スピン三重項超伝導体として注目を集めている重い電子系超伝導体UTe2に関する理論研究を行った。この物質の第一原理計算を参考にして24バンド3次元周期アンダーソン模型を構築し、ランダム位相近似により超伝導不安定性を調べた。その結果により、強磁性－反強磁性クロスオーバーが圧力下で起こること、またそれに伴って超伝導相のパリティ転移が起こることを提案した。これらの結果に基づいて、圧力下の多重超伝導相図を解析した。
さらに、超伝導体のパリティ転移に伴い、偶パリティ超伝導と奇パリティ超伝導が共存する超伝導状態が安定になることを提案し、その共存相の性質を解明した。特にポーラーな対称性を持つアナポール超伝導を発見し、そこではボゴリウボフ準粒子のスペクトルが非対称になり、クーパー対が有限の重心運動量を獲得することを示した。

Research Progress Status

令和3年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和3年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] カルフォルニア州立大学バークレー校(米国)
  • Country Name: U.S.A.
  • Counterpart Institution: カルフォルニア州立大学バークレー校
• [Int'l Joint Research] フランス原子力庁(フランス)
  • Country Name: FRANCE
  • Counterpart Institution: フランス原子力庁
• [Int'l Joint Research] Far Eastern Federal University(ロシア連邦)
  • Country Name: RUSSIA FEDERATION
  • Counterpart Institution: Far Eastern Federal University
• [Int'l Joint Research] スイス連邦工科大学/チューリッヒ大学(スイス)
  • Country Name: SWITZERLAND
  • Counterpart Institution: スイス連邦工科大学/チューリッヒ大学
• [Int'l Joint Research] 北欧理論物理学研究所(スウェーデン)
  • Country Name: SWEDEN
  • Counterpart Institution: 北欧理論物理学研究所
• [Int'l Joint Research] カルフォルニア州立大学バークレー校(米国)
  • Country Name: U.S.A.
  • Counterpart Institution: カルフォルニア州立大学バークレー校
• [Int'l Joint Research] スイス連邦工科大学チューリッヒ校(スイス)
  • Country Name: SWITZERLAND
  • Counterpart Institution: スイス連邦工科大学チューリッヒ校
• [Int'l Joint Research] フランス原子力庁(フランス)
  • Country Name: FRANCE
  • Counterpart Institution: フランス原子力庁
• [Journal Article] Nonlinear optical responses in noncentrosymmetric superconductors (2023)
  • Author(s): Tanaka Hiroto、Watanabe Hikaru、Yanase Youichi
  • Journal Title: Physical Review B Volume: 107 Pages: 024513/1-20
  • DOI: 10.1103/PhysRevB.107.024513
  • Peer Reviewed
• [Journal Article] Superconductivity and Local Inversion-Symmetry Breaking (2023)
  • Author(s): Fischer Mark H.、Sigrist Manfred、Agterberg Daniel F.、Yanase Youichi
  • Journal Title: Annual Review of Condensed Matter Physics Volume: 14 Pages: 153～172
  • DOI: 10.1146/annurev-conmatphys-040521-042511
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Intrinsic Superconducting Diode Effect (2022)
  • Author(s): Daido Akito、Ikeda Yuhei、Yanase Youichi
  • Journal Title: Physical Review Letters Volume: 128 Pages: 037001/1-6
  • DOI: 10.1103/PhysRevLett.128.037001
  • Peer Reviewed
• [Journal Article] Anapole superconductivity from PT-symmetric mixed-parity interband pairing (2022)
  • Author(s): Kanasugi Shota、Yanase Youichi
  • Journal Title: Communications Physics Volume: 5 Pages: 39/1-10
  • DOI: 10.1038/s42005-022-00804-7
  • Peer Reviewed / Open Access
• [Journal Article] Superconducting piezoelectric effect (2022)
  • Author(s): Chazono Michiya、Watanabe Hikaru、Yanase Youichi
  • Journal Title: Physical Review B Volume: 105 Pages: 024509/1-8
  • DOI: 10.1103/PhysRevB.105.024509
  • Peer Reviewed
• [Journal Article] Nonreciprocal optical response in parity-breaking superconductors (2022)
  • Author(s): Watanabe Hikaru、Daido Akito、Yanase Youichi
  • Journal Title: Physical Review B Volume: 105 Pages: 024308/1-27
  • DOI: 10.1103/PhysRevB.105.024308
  • Peer Reviewed
• [Journal Article] Nonreciprocal Meissner response in parity-mixed superconductors (2022)
  • Author(s): Watanabe Hikaru、Daido Akito、Yanase Youichi
  • Journal Title: Physical Review B Volume: 105 Pages: L100504/1-6
  • DOI: 10.1103/PhysRevB.105.L100504
  • Peer Reviewed
• [Journal Article] Topological d-wave superconductivity in two dimensions (2022)
  • Author(s): Yanase Youichi、Daido Akito、Takasan Kazuaki、Yoshida Tsuneya
  • Journal Title: Physica E: Low-dimensional Systems and Nanostructures Volume: 140 Pages: 115143/1-22
  • DOI: 10.1016/j.physe.2022.115143
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Superconductivity in monolayer FeSe enhanced by quantum geometry (2022)
  • Author(s): Kitamura Taisei、Yamashita Tatsuya、Ishizuka Jun、Daido Akito、Yanase Youichi
  • Journal Title: Physical Review Research Volume: 4 Pages: 023232/1-13
  • DOI: 10.1103/PhysRevResearch.4.023232
  • Peer Reviewed / Open Access
• [Journal Article] Supercurrent-induced topological phase transitions (2022)
  • Author(s): Takasan Kazuaki、Sumita Shuntaro、Yanase Youichi
  • Journal Title: Physical Review B Volume: 106 Pages: 014508/1-14
  • DOI: 10.1103/PhysRevB.106.014508
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Field-free superconducting diode effect in noncentrosymmetric superconductor/ferromagnet multilayers (2022)
  • Author(s): Narita Hideki、Ishizuka Jun、Kawarazaki Ryo、Kan Daisuke、Shiota Yoichi、Moriyama Takahiro、Shimakawa Yuichi、Ognev Alexey V.、Samardak Alexander S.、Yanase Youichi、Ono Teruo
  • Journal Title: Nature Nanotechnology Volume: 17 Pages: 823～828
  • DOI: 10.1038/s41565-022-01159-4
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] First Observation of the de Haas van Alphen Effect and Fermi Surfaces in the Unconventional Superconductor UTe₂ (2022)
  • Author(s): Aoki Dai、Sakai Hironori、Opletal Petr、Tokiwa Yoshifumi、Ishizuka Jun、Yanase Youichi、Harima Hisatomo、Nakamura Ai、Li Dexin、Homma Yoshiya、Shimizu Yusei、Knebel Georg、Flouquet Jacques、Haga Yoshinori
  • Journal Title: Journal of the Physical Society of Japan Volume: 91 Pages: 083704/1-5
  • DOI: 10.7566/JPSJ.91.083704
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Even-odd parity transition in strongly correlated locally noncentrosymmetric superconductors: Application to CeRh2As2 (2022)
  • Author(s): Nogaki Kosuke、Yanase Youichi
  • Journal Title: Physical Review B Volume: 106 Pages: L100504/1-7
  • DOI: 10.1103/PhysRevB.106.L100504
  • Peer Reviewed
• [Journal Article] Quantum geometric effect on Fulde-Ferrell-Larkin-Ovchinnikov superconductivity (2022)
  • Author(s): Kitamura Taisei、Daido Akito、Yanase Youichi
  • Journal Title: Physical Review B Volume: 106 Pages: 184507/1-19
  • DOI: 10.1103/PhysRevB.106.184507
  • Peer Reviewed
• [Journal Article] Superconducting diode effect and nonreciprocal transition lines (2022)
  • Author(s): Daido Akito、Yanase Youichi
  • Journal Title: Physical Review B Volume: 106 Pages: 205206/1-19
  • DOI: 10.1103/PhysRevB.106.205206
  • Peer Reviewed
• [Journal Article] Polarization-controlled tunable directional spin-driven photocurrents in a magnetic metamaterial with threefold rotational symmetry (2022)
  • Author(s): Matsubara Masakazu、Kobayashi Takatsugu、Watanabe Hikaru、Yanase Youichi、Iwata Satoshi、Kato Takeshi
  • Journal Title: Nature Communications Volume: 13 Pages: 6708/1-8
  • DOI: 10.1038/s41467-022-34374-7
  • Peer Reviewed
• [Journal Article] Direct measurement of the evolution of magnetism and superconductivity toward the quantum critical point (2022)
  • Author(s): Higemoto Wataru、Yokoyama Makoto、Ito Takashi U.、Suzuki Taiga、Raymond St?phane、Yanase Youichi
  • Journal Title: Proceedings of the National Academy of Sciences Volume: 119 Pages: e2209549119/1-6
  • DOI: 10.1073/pnas.2209549119
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetic-field-induced polarity oscillation of superconducting diode effect (2022)
  • Author(s): Kawarazaki Ryo、Narita Hideki、Miyasaka Yuta、Ikeda Yuhei、Hisatomi Ryusuke、Daido Akito、Shiota Yoichi、Moriyama Takahiro、Yanase Youichi、Ognev Alexey V.、Samardak Alexander S.、Ono Teruo
  • Journal Title: Applied Physics Express Volume: 15 Pages: 113001/1-5
  • DOI: 10.35848/1882-0786/ac99b9
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Unconventional superconductivity in UTe2 (2022)
  • Author(s): Aoki D、Brison J-P、Flouquet J、Ishida K、Knebel G、Tokunaga Y、Yanase Y
  • Journal Title: Journal of Physics: Condensed Matter Volume: 34 Pages: 243002/1-41
  • DOI: 10.1088/1361-648X/ac5863
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Thermodynamic electric quadrupole moments of nematic phases from first-principles calculations (2021)
  • Author(s): Kitamura Taisei、Ishizuka Jun、Daido Akito、Yanase Youichi
  • Journal Title: Physical Review B Volume: 103 Pages: 245114/1-13
  • DOI: 10.1103/PhysRevB.103.245114
  • Peer Reviewed
• [Journal Article] Topological crystalline superconductivity in locally noncentrosymmetric CeRh2As2 (2021)
  • Author(s): Nogaki Kosuke、Daido Akito、Ishizuka Jun、Yanase Youichi
  • Journal Title: Physical Review Research Volume: 3 Pages: L032071/1-8
  • DOI: 10.1103/PhysRevResearch.3.L032071
  • Peer Reviewed / Open Access
• [Journal Article] Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe2 (2021)
  • Author(s): Li Dexin、Nakamura Ai、Honda Fuminori、Sato Yoshiki J.、Homma Yoshiya、Shimizu Yusei、Ishizuka Jun、Yanase Youichi、Knebel Georg、Flouquet Jacques、Aoki Dai
  • Journal Title: Journal of the Physical Society of Japan Volume: 90 Pages: 073703/1-5
  • DOI: 10.7566/JPSJ.90.073703
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Photocurrent response in parity-time symmetric current-ordered states (2021)
  • Author(s): Watanabe Hikaru、Yanase Youichi
  • Journal Title: Physical Review B Volume: 104 Pages: 024416/1-10
  • DOI: 10.1103/PhysRevB.104.024416
  • Peer Reviewed
• [Journal Article] Observation of nonreciprocal superconducting critical field (2021)
  • Author(s): Miyasaka Yuta、Kawarazaki Ryo、Narita Hideki、Ando Fuyuki、Ikeda Yuhei、Hisatomi Ryusuke、Daido Akito、Shiota Yoichi、Moriyama Takahiro、Yanase Youichi、Ono Teruo
  • Journal Title: Applied Physics Express Volume: 14 Pages: 073003/1-3
  • DOI: 10.35848/1882-0786/ac03c0
  • Peer Reviewed
• [Journal Article] Topological gapless points in superconductors: From the viewpoint of symmetry (2021)
  • Author(s): Sumita Shuntaro、Yanase Youichi
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 2022 Pages: ptab124/1-19
  • DOI: 10.1093/ptep/ptab124
  • Peer Reviewed
• [Journal Article] Chiral Photocurrent in Parity-Violating Magnet and Enhanced Response in Topological Antiferromagnet (2021)
  • Author(s): Watanabe Hikaru、Yanase Youichi
  • Journal Title: Physical Review X Volume: 11 Pages: 011001/1-30
  • DOI: 10.1103/PhysRevX.11.011001
  • Peer Reviewed / Open Access
• [Journal Article] Periodic Anderson model for magnetism and superconductivity in UTe2 (2021)
  • Author(s): Ishizuka Jun、Yanase Youichi
  • Journal Title: Physical Review B Volume: 103 Pages: 094504/1-9
  • DOI: 10.1103/PhysRevB.103.094504
  • Peer Reviewed
• [Journal Article] Bond Directional Anapole Order in a Spin-Orbit Coupled Mott Insulator Sr2(Ir1-xRhx)O4 (2021)
  • Author(s): Murayama H.、Ishida K.、Kurihara R.、Ono T.、Sato Y.、Kasahara Y.、Watanabe H.、Yanase Y.、Cao G.、Mizukami Y.、Shibauchi T.、Matsuda Y.、Kasahara S.
  • Journal Title: Physical Review X Volume: 11 Pages: 011021/1-11
  • DOI: 10.1103/PhysRevX.11.011021
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Multiple odd-parity superconducting phases in bilayer transition metal dichalcogenides (2020)
  • Author(s): Kanasugi Shota、Yanase Youichi
  • Journal Title: Physical Review B Volume: 102 Pages: 094507/1-11
  • DOI: 10.1103/PhysRevB.102.094507
  • Peer Reviewed
• [Journal Article] Giant surface Edelstein effect in d-wave superconductors (2020)
  • Author(s): Ikeda Yuhei、Yanase Youichi
  • Journal Title: Physical Review B Volume: 102 Pages: 214510/1-9
  • DOI: 10.1103/PhysRevB.102.214510
  • Peer Reviewed
• [Journal Article] Strongly parity-mixed superconductivity in the Rashba-Hubbard model (2020)
  • Author(s): Nogaki Kosuke、Yanase Youichi
  • Journal Title: Physical Review B Volume: 102 Pages: 165114/1-7
  • DOI: 10.1103/PhysRevB.102.165114
  • Peer Reviewed
• [Journal Article] Ferroelectricity-induced multiorbital odd-frequency superconductivity in SrTiO3 (2020)
  • Author(s): Kanasugi Shota、Kuzmanovski Dushko、Balatsky Alexander V.、Yanase Youichi
  • Journal Title: Physical Review B Volume: 102 Pages: 184506/1-12
  • DOI: 10.1103/PhysRevB.102.184506
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Laser-induced topological s-wave superconductivity in bilayer transition metal dichalcogenides (2020)
  • Author(s): Chono Hiroomi、Takasan Kazuaki、Yanase Youichi
  • Journal Title: Physical Review B Volume: 102 Pages: 174508/1-9
  • DOI: 10.1103/PhysRevB.102.174508
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Thermodynamic approach to electric quadrupole moments (2020)
  • Author(s): Daido Akito、Shitade Atsuo、Yanase Youichi
  • Journal Title: Physical Review B Volume: 102 Pages: 235149/1-12
  • DOI: 10.1103/PhysRevB.102.235149
  • Peer Reviewed
• [Presentation] 局所反転対称性のない結晶構造の超伝導 (2022)
  • Author(s): 柳瀬陽一
  • Organizer: 日本物理学会年次大会
  • Invited
• [Presentation] Symmetry and topology in heavy fermion superconductors (2022)
  • Author(s): Youichi Yanase
  • Organizer: Young investigators online workshop on unconventional superconductivity in heavy fermions
  • Int'l Joint Research / Invited
• [Presentation] Parity transition, parity violation, and topological superconductivity in UTe2 and CeRh2As2 (2022)
  • Author(s): Youichi Yanase
  • Organizer: International conference on Strongly Correlated Electron Systems (SCES2022)
  • Int'l Joint Research / Invited
• [Presentation] Parity transition and topological superconductivity in a locally noncentrosymmetric superconductor CeRh2As2 (2022)
  • Author(s): Youichi Yanase
  • Organizer: International conference on Low Temperature (LT29)
  • Int'l Joint Research / Invited
• [Presentation] Parity violation and topological superconductivity in heavy fermions (2022)
  • Author(s): Youichi Yanase
  • Organizer: The 15th Asia Pacific Physics Conference (APPC15)
  • Int'l Joint Research / Invited
• [Presentation] Nonreciprocal responses in superconductors: finite-q pairing, parity mixing, and quantum geometry (2022)
  • Author(s): Youichi Yanase
  • Organizer: Novel Quantum States in Condensed Matter (NQS2022)
  • Int'l Joint Research / Invited
• [Presentation] Nonreciprocal electric responses in superconductors (2022)
  • Author(s): Youichi Yanase
  • Organizer: The 35th International Symposium on Superconductivity (ISS2022)
  • Int'l Joint Research / Invited
• [Presentation] Nontrivial topology, symmetry breaking, and nonreciprocal responses in superconducting UTe2 (2022)
  • Author(s): Youichi Yanase
  • Organizer: GIMRT, REIMEI and IRN joint international workshop "Superconductivity, Structural Complexity and Topology of UTe2 and Aperiodic Crystals"
  • Int'l Joint Research / Invited
• [Presentation] Locally noncentrosymmetric superconductivity in CeRh2As2 (2022)
  • Author(s): Youichi Yanase
  • Organizer: The international conference on Spectroscopies in Novel Superconductors (SNS2022)
  • Int'l Joint Research / Invited
• [Presentation] Insulator-metal transition, topological superconductivity, and parity violation in UTe2 (2021)
  • Author(s): Youichi Yanase
  • Organizer: MRS Spring 2021
  • Int'l Joint Research / Invited
• [Presentation] Parity transition, parity violation, and topological superconductivity in heavy fermion superconductors (2021)
  • Author(s): Youichi Yanase
  • Organizer: Correlated Electrons Virtual International Seminars 2021 (CEVIS 2021)
  • Int'l Joint Research / Invited
• [Presentation] パリティを破る磁性体の光電流応答 (2021)
  • Author(s): 柳瀬陽一
  • Organizer: 日本学術振興会光電相互変換第１２５委員会 第２５３回研究会
  • Invited
• [Presentation] Topological superconductivity in two-dimensional heterostructures (2021)
  • Author(s): Youichi Yanase
  • Organizer: International Symposium on Creation of Advanced Photonic and Electronic Devices 2021
  • Int'l Joint Research / Invited
• [Presentation] Noncentrosymmetric superconductivity in atomic-layer materials (2021)
  • Author(s): 柳瀬陽一
  • Organizer: SPring-8ユーザー協同体 顕微ナノ材料科学研究会 日本表面真空学会 放射光表面科学研究部会 プローブ顕微鏡研究部会 合同シンポジウム (Nanospec 2021)
  • Invited
• [Presentation] A Theory from First-principles on Magnetism and Superconductivity in UTe2 (2021)
  • Author(s): Youichi Yanase
  • Organizer: APS March meeting 2021
  • Int'l Joint Research / Invited
• [Presentation] UTe2における金属絶縁体転移とバンド構造、トポロジカル超伝導 (2020)
  • Author(s): 柳瀬陽一
  • Organizer: 日本物理学会秋季大会
  • Invited
• [Presentation] Symmetry and topology of superconducting CeCoIn5 heterostructures (2020)
  • Author(s): Youichi Yanase
  • Organizer: 20 years of the 115's: past, present, and future
  • Int'l Joint Research / Invited
• [Presentation] Spin-orbit-coupled ferroelectric superconductivity and multiorbital effects in SrTiO3 (2020)
  • Author(s): Youichi Yanase
  • Organizer: Microscopics of Superconductivity in Perovskite Oxides: Challenges, Hurdles and Enigmas (MISPOCHE-2020)
  • Int'l Joint Research / Invited
• [Remarks] 柳瀬陽一の研究
  • URL: http://cond.scphys.kyoto-u.ac.jp/~yanase/study.html