Theoretical investigations for novel ordered states in Fermion and Boson superfluids

• Project/Area Number: 21340103
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Okayama University
• Principal Investigator: MACHIDA Kazushige 岡山大学, 自然科学研究科, 名誉教授 (50025491)
• Project Period (FY): 2009-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000); Fiscal Year 2013: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000); Fiscal Year 2012: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000); Fiscal Year 2011: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2010: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2009: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: 超伝導体 / 超流動 / 中性原子気体 / 超伝導 / 多バンド系 / 小角中性子散乱 / 磁化 / 渦格子 / 重い電子系超伝導 / 対関数 / スカーミオン / 超流動ヘリウム３ / スピン軌道相互作用 / 重い電子系 / UPt3 / 超流動ヘリウム3

Outline of Final Research Achievements

We have theoretically investigated novel superfluid states in Fermion and Boson systems. As for the fermions, we study superconducting states under applied magnetic fields and identify the pairing functions for the three heavy fermion materials: CeCu2Si2, UPt3 and UBe13 in collaboration with experimental groups. We have succeeded in determining the pairing symmetries for each material and new identification of full gapped multi bands for CeCu2Si2.
As for the bosons, we find the stable skyrmion states by introducing an artificial guage potential.

Research Products

• [Journal Article] Multibannd effects on Fulde-Ferrell-Larkin-Ovchinnikov states of Pauli limited superconductors (2014)
  • Author(s): M. Takahashi, T. Mizushima, K. Machida
  • Journal Title: Phys. Rev. B Volume: 89 Issue: 6 Pages: 064505-064505
  • DOI: 10.1103/physrevb.89.064505
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Anisotropy of the superconducting state in Se2RuO4 (2013)
  • Author(s): C. Rastovski, et al
  • Journal Title: Phys. Rev. Lett. Volume: 111 Issue: 8
  • DOI: 10.1103/physrevlett.111.087003
  • Peer Reviewed
• [Journal Article] Symmetry Protected Topological Order and Spin Susceptibility in Superfluid 3He-B (2013)
  • Author(s): T. Mizushima, M. Sato, and K. Machida
  • Journal Title: Phys. Rev. Lett. Volume: 109 Issue: 16
  • DOI: 10.1103/physrevlett.109.165301
  • Peer Reviewed
• [Journal Article] Twofold Spontaneous Symmetry Breaking in the Heavy-Fermion Superconductor UPt3 (2012)
  • Author(s): Y. Machida
  • Journal Title: Phys. Rev. Lett. Volume: 108 Issue: 15 Pages: 157002-157002
  • DOI: 10.1103/physrevlett.108.157002
  • Peer Reviewed
• [Journal Article] Stable Skyrmions in SU(2) Gauged Bose-Einstein Condensates (2012)
  • Author(s): Takuto Kawakami, et al.
  • Journal Title: Physical Review Letters Volume: 109 Issue: 1 Pages: 15301-15301
  • DOI: 10.1103/physrevlett.109.015301
  • Peer Reviewed
• [Journal Article] Majorana surface states of superfluid 3He A and B phases in a slab (2011)
  • Author(s): Y.Tsutsumi
  • Journal Title: Phys.Rev.B Volume: 83 Pages: 1-12
  • Peer Reviewed
• [Journal Article] Field Evolution of the Fulde-Ferrell-Larkin-Ovchinnikov State in a Superconductor with Strong Pauli Effects (2011)
  • Author(s): K.M.Suzuki
  • Journal Title: J.Phys.Soc.Jpn. Volume: 80 Pages: 1-4
  • Peer Reviewed
• [Journal Article] Skyrmion lattice and intrinsic angular momentum effect in the superfluid 3He A-phase under rotation (2010)
  • Author(s): H.Ichioka
  • Journal Title: Phys.Rev.B Volume: 81 Pages: 1-6
  • Peer Reviewed
• [Presentation] 一軸異方性超伝導体における磁束線格子構造因子の準古典理論 (2014)
  • Author(s): 天野雄次郎，石原将裕，市岡優典，町田一成
  • Organizer: 日本物理学会
  • Place of Presentation: 東海大学（平塚）
  • Year and Date: 2014-03-27 – 2014-03-30
• [Presentation] FFLO states in two band superconductors (2012)
  • Author(s): 町田一成, 高橋雅裕, 水島健
  • Organizer: 第20回渦糸物理国内会議
  • Place of Presentation: 鷲羽山(倉敷)
• [Presentation] 準古典理論によるFFLO状態の磁場変化 (2011)
  • Author(s): 鈴木健太
  • Organizer: 日本物理学会
  • Place of Presentation: 富山大学