Study of exotic superconductivity by combining microscopic theory and phenomenological theory

• Project/Area Number: 24740230
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Kyoto University (2015); Niigata University (2012-2014)
• Principal Investigator: Yanase Youichi 京都大学, 理学(系)研究科(研究院), 准教授 (70332575)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: スピン軌道相互作用 / エキゾチック超伝導 / 奇パリティ多極子 / 自発的対称性の破れ / 強相関電子系 / トポロジカル結晶超伝導 / カイラル超伝導 / 量子渦状態 / 超伝導理論 / 超伝導 / 量子渦

Outline of Final Research Achievements

(1) We determined the superconducting phase diagram of Sr2RuO4 in the magnetic field with the use of the microscopic theory based on the three-orbital Hubbard model. We showed a variety of superconducting phases in the c-axis magnetic field. In particular, the chiral-II phase is a skyrmion lattice phase consisting of the fractional quantum vortices. (2) We showed the magnetoelectric effects and exotic superconducting phases in locally noncentrosymmetric systems. (3) We investigated the nematic-chiral superconducting state in URu2Si2 and predicted structural transitions in vortex lattice. (4) We showed that the superconducting phase in locally noncentrosymmetric system is a topological superconducting phase protected by mirror symmetry.

Research Products

• [Int'l Joint Research] スイス連邦工科大学(スイス)
• [Int'l Joint Research] 成均館大学(韓国)
• [Journal Article] Superconductivity protected by spin-valley locking in ion-gated MoS2 (2016)
  • Author(s): Yu Saito, Yasuharu Nakamura, Mohammad Saeed Baharamy, Yoshimitsu Kohama, Yuichi Kasahara, Yuji Nakagawa, Masaru Onga, Masashi Tokunaga, Tsutomu Nojima, Youichi Yanase, and Yoshihiro Iwasa
  • Journal Title: Nature Physics Volume: 12 Issue: 2 Pages: 144-149
  • DOI: 10.1038/nphys3580
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Topological D+p-wave superconductivity in Rashba systems (2016)
  • Author(s): T. Yoshida and Y. Yanase
  • Journal Title: Phys. Rev. B Volume: 93 Issue: 5
  • DOI: 10.1103/physrevb.93.054504
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Robust zero-energy bound states around a pair-density-wave vortex core in locally noncentrosymmetric superconductors (2016)
  • Author(s): Yoichi Higashi, Yuki Nagai, Tomohiro Yoshida, Yusuke Masaki, and Youichi Yanase
  • Journal Title: Phys. Rev. B Volume: 93 Issue: 10
  • DOI: 10.1103/physrevb.93.104529
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Topological Crystalline Superconductivity in Locally Non-centrosymmetric Multilayer Superconductors (2015)
  • Author(s): T. Yoshida, M. Sigrist and Y. Yanase
  • Journal Title: Phys. Rev. Lett. Volume: 115 Issue: 2
  • DOI: 10.1103/physrevlett.115.027001
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Electron Correlation Effects in Non-centrosymmetric Metals in the Weak Coupling Regime (2015)
  • Author(s): D. Maruyama and Y. Yanase
  • Journal Title: J. Phys. Soc. Jpn. Volume: 84 Issue: 7 Pages: 074702-074702
  • DOI: 10.7566/jpsj.84.074702
  • NAID: 40020522636
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Odd-parity superconductivity by competing spin-orbit coupling and orbital effect in artificial heterostructures (2015)
  • Author(s): T. Watanabe, T. Yoshida and Y. Yanase
  • Journal Title: Phys. Rev. B Volume: 92 Issue: 17
  • DOI: 10.1103/physrevb.92.174502
  • NAID: 120005712927
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Chiral superconductivity in nematic states (2015)
  • Author(s): Shuhei Takamatsu and Youichi Yanase
  • Journal Title: Phys. Rev. B Volume: 91 Issue: 5
  • DOI: 10.1103/physrevb.91.054504
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Spin-orbit Coupling and Multiple Phases in Spin-triplet Superconductor Sr$_2$RuO$_4$ (2014)
  • Author(s): Youichi Yanase, Shuhei Takamatsu, Masafumi Udagawa
  • Journal Title: Journal of the Physical Society of Japan Volume: 83 Issue: 6 Pages: 061019-061019
  • DOI: 10.7566/jpsj.83.061019
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Complex-stripe phases induced by staggered Rashba spin-orbit coupling (2013)
  • Author(s): T. Yoshida, M. Sigrist, and Y. Yanase
  • Journal Title: J. Phys. Soc. Jpn. Volume: 82 Issue: 7 Pages: 074714-074714
  • DOI: 10.7566/jpsj.82.074714
  • NAID: 40019697006
  • Peer Reviewed
• [Journal Article] Magneto-Electric Effect in Three-dimensional Coupled Zigzag Chains (2013)
  • Author(s): Y. Yanase
  • Journal Title: J. Phys. Soc. Jpn. Volume: 83 Issue: 1 Pages: 014703-014703
  • DOI: 10.7566/jpsj.83.014703
  • NAID: 40019944832
  • Peer Reviewed
• [Journal Article] Electronic Structure and Non-centrosymmetric Superconductivitity in Three Orbital t_2g Model with Spin-orbit Coupling: Sr_2RuO_4 near [001] Surface/Interface (2013)
  • Author(s): Y. Yanase
  • Journal Title: J. Phys. Soc. Jpn. Volume: 82 Issue: 4 Pages: 44711-44711
  • DOI: 10.7566/jpsj.82.044711
  • Peer Reviewed
• [Presentation] 非共型ワイル超伝導体UPt3におけるトポロジカル表面状態 (2016)
  • Author(s): 柳瀬陽一
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学泉キャンパス
  • Year and Date: 2016-03-22
• [Presentation] 常磁性に誘起された異方的トポロジカル超伝導 (2016)
  • Author(s): 大同暁人, 柳瀬陽一
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学泉キャンパス
  • Year and Date: 2016-03-22
• [Presentation] 磁気多極子状態における超伝導 (2016)
  • Author(s): 角田峻太郎, 柳瀬陽一
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学泉キャンパス
  • Year and Date: 2016-03-21
• [Presentation] スピン軌道相互作用が誘起するエキゾチック超伝導 (2016)
  • Author(s): 柳瀬陽一
  • Organizer: Workshop: CROSSroads of Users and J-PARC第17回「強相関電子系の凝縮状態」
  • Place of Presentation: CROSS東海
  • Year and Date: 2016-01-19
  • Invited
• [Presentation] Topologocail d-wave superconductivity (2015)
  • Author(s): 柳瀬陽一
  • Organizer: 新学術領域 ＴＭＳ 領域研究会
  • Place of Presentation: 京都大学
  • Year and Date: 2015-12-13
• [Presentation] Exotic superconductivity in 2D systems by spin-orbit coupling (2015)
  • Author(s): 柳瀬陽一
  • Organizer: CEMS Topical meeting on “Emergent 2D Materials”
  • Place of Presentation: 理化学研究所
  • Year and Date: 2015-12-12
  • Int'l Joint Research / Invited
• [Presentation] スピン三重項超伝導体UPt3におけるグライド対称性とワイル超伝導 (2015)
  • Author(s): 柳瀬陽一
  • Organizer: 新学術領域「トポ物質科学」研究会 「ワイル半金属・超伝導」
  • Place of Presentation: 東北大学
  • Year and Date: 2015-11-07
• [Presentation] Exotic superconductivity in artificial heterostructures (2015)
  • Author(s): 柳瀬陽一
  • Organizer: CEMS Topical meeting on “Oxide interfaces”,
  • Place of Presentation: 理化学研究所
  • Year and Date: 2015-11-06
  • Int'l Joint Research / Invited
• [Presentation] 強相関電子系におけるトポロジカル超伝導 (2015)
  • Author(s): 柳瀬陽一
  • Organizer: Workshop: CROSSroads of Users and J-PARC第16回「電子物性研究とその将来」
  • Place of Presentation: CROSS東海
  • Year and Date: 2015-10-15
  • Invited
• [Presentation] 2次元物質における電界誘起超伝導のエキゾチック物性 (2015)
  • Author(s): 斎藤優, 中村康晴, モハマド・サイード・バハラミー, 小濱芳光, 笠原裕一, 叶劍挺, 徳永将史, 柳瀬陽一, 野島勉, 岩佐義宏
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学
  • Year and Date: 2015-09-19
• [Presentation] UPt3におけるNon-symmorphic超伝導：スピン軌道相互作用が誘起するラインノードとワイル超伝導 (2015)
  • Author(s): 柳瀬陽一
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学
  • Year and Date: 2015-09-18
• [Presentation] URu2Si2における多重超伝導相図と上部臨界磁場の面内異方性 (2015)
  • Author(s): 高松周平, 播磨尚朝, 青木大, 柳瀬陽一
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学
  • Year and Date: 2015-09-18
• [Presentation] 二層系電子ネマチック秩序相における局所的なパリティの破れが誘起する電気八極子状態 (2015)
  • Author(s): 人見尚典, 柳瀬陽一
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学
  • Year and Date: 2015-09-18
• [Presentation] 多層系超伝導体におけるトポロジカル結晶超伝導 (2015)
  • Author(s): 吉田智大, Manfred Sigrist, 柳瀬陽一
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学
  • Year and Date: 2015-09-18
• [Presentation] 多層MoS2におけるNon-symmorphic超伝導 (2015)
  • Author(s): 中村康晴, 柳瀬陽一
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学
  • Year and Date: 2015-09-17
• [Presentation] スピン軌道相互作用がある系の奇パリティ多極子と奇パリティ超伝導 (2015)
  • Author(s): 柳瀬陽一
  • Organizer: 新学術領域 Jphysics キックオフミーティング
  • Place of Presentation: 神戸大学
  • Year and Date: 2015-09-15
• [Presentation] Topological superconductivity in heavy fermion superlattices (2015)
  • Author(s): 柳瀬陽一
  • Organizer: M2S2015
  • Place of Presentation: Geneva, Switzerland
  • Year and Date: 2015-08-24
  • Int'l Joint Research
• [Presentation] URu2Si2 におけるネマティックカイラル超伝導 (2015)
  • Author(s): 柳瀬陽一
  • Organizer: 基礎物理学研究所短期研究会「多自由度と相関効果が生み出す超伝導の新潮流 ～BCSからBECまで～」
  • Place of Presentation: 京都大学基礎物理学研究所
  • Year and Date: 2015-06-10
• [Presentation] Chiral superconductivity in nematic states (2014)
  • Author(s): S. Takamatsu, H. Harima, D. Aoki, Y. Yanase
  • Organizer: International conference on topological quantum phenomena
  • Place of Presentation: Kyoto, Japan
  • Year and Date: 2014-12-18
• [Presentation] Vortex state in URu2Si2 and UPt3: Chiral superconductivity in the nematic state (2014)
  • Author(s): Y. Yanase
  • Organizer: Reimei-ICC-IMR workshop
  • Place of Presentation: Sendai, Japan
  • Year and Date: 2014-12-05
• [Presentation] バンド計算に基づくURu2Si2における磁場中超伝導状態の解析 (2014)
  • Author(s): 高松周平，播磨尚朝，青木大，柳瀬陽一
  • Organizer: 日本物理学会2014年秋季大会
  • Place of Presentation: 中部大学
  • Year and Date: 2014-09-08
• [Presentation] Multiple superconducting phases and vortex lattice structures in URu2Si2 (2014)
  • Author(s): S. Takamatsu, H. Harima, D. Aoki, Y. Yanase
  • Organizer: International Conference on Strongly Correlated Electron Systems
  • Place of Presentation: Grenoble, France
  • Year and Date: 2014-07-10
• [Presentation] Chiral superconducting state of Sr2RuO4 and URu2Si2 in the magnetic field (2014)
  • Author(s): Y. Yanase
  • Organizer: The ISSP International Workshop, “New Horizon of Strongly Correlated Physics”
  • Place of Presentation: Kashiwa, Japan
  • Year and Date: 2014-06-27
  • Invited
• [Presentation] 多層系人工超格子における複素ストライプ相の理論研究
  • Author(s): 渡辺達也，柳瀬陽一，吉田智大
  • Organizer: 日本物理学会 第69回年次大会
  • Place of Presentation: 東海大学湘南キャンパス、平塚市
• [Presentation] 3次元ジグザグ格子系における電気磁気効果と電流誘起反強磁性
  • Author(s): 柳瀬陽一
  • Organizer: 日本物理学会 2013年秋季大会
  • Place of Presentation: 徳島大学、徳島市
• [Presentation] 弱いスピン軌道相互作用を含むGLモデルに基づくSr2RuO4のc軸磁場中超伝導相図の解析
  • Author(s): 高松周平，柳瀬陽一
  • Organizer: 日本物理学会 2012年秋季大会
  • Place of Presentation: 横浜国立大学
• [Presentation] 多成分GLモデルに基づくSr2RuO4における半整数量子渦格子の理論
  • Author(s): 高松周平，柳瀬陽一
  • Organizer: 日本物理学会 第68回年次大会
  • Place of Presentation: 広島大学
• [Presentation] Sr2RuO4[001]界面近傍での空間反転対称性がない超伝導状態
  • Author(s): 川辺俊介，吉田智大，柳瀬陽一
  • Organizer: 日本物理学会 第68回年次大会
  • Place of Presentation: 広島大学
• [Presentation] スピン三重項超伝導体の スピン軌道相互作用とｄベクトル
  • Author(s): 柳瀬陽一，高松周平
  • Organizer: 物性研共同利用・CCMS・元素戦略合同研究会「計算物性物理学の新展開」
  • Place of Presentation: 東京大学物性研究所
  • Invited
• [Presentation] Multicomponent Ginzburg-Landau theory for spin triplet superconducting states of Sr_2 RuO_4
  • Author(s): S. Takamatu and Y. Yanase
  • Organizer: International conference on topological quantum phenomena
  • Place of Presentation: Nagoya, Japan
• [Presentation] Exotic superconductivity in locally non-centrosymmetric systems
  • Author(s): Y. Yanase, D. Maruyama, T. Yoshida, and M. Sigrist
  • Organizer: International conference on topological quantum phenomena
  • Place of Presentation: Nagoya, Japan
• [Remarks] 柳瀬陽一の研究
  • URL: http://cond.scphys.kyoto-u.ac.jp/~yanase/study.html
• [Remarks] 柳瀬研究室の研究業績
  • URL: http://bussei.gs.niigata-u.ac.jp/~yanase/study.html