Superfluid fluctuations in the BCS-BEC crossover regime of a trapped Fermi gas

2012 Fiscal Year Final Research Report

• Project/Area Number: 22540412
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: Keio University
• Principal Investigator: OHASHI Yoji 慶應義塾大学, 理工学部, 教授 (60272134)
• Project Period (FY): 2010 – 2012
• Keywords: BCS-BEC / クロスオーバー / トラップポテンシャル / フェルミ原子ガス / 擬ギャップ / 超流動 / 超流動ゆらぎ

Research Abstract

I have theoretically investigated strong coupling effects of a trapped gas of Fermi atoms in the BCS-BEC crossover region. I have clarified that spatial inhomogeneity due to the trap potential leads to the shell structure where the superfluid region aroun

Research Products

• [Journal Article] Coexistence of superfluid gap and pseudogap in the BCS-BEC crossover regime of a trapped Fermi gas below Tc (2012)
  • Author(s): R. Watanabe, S. Tsuchiya, and Y. Ohashi
  • Journal Title: Physical Review A Volume: 86巻 Pages: 063603(1-11)
  • DOI: DOI:10.1103/PhysRevA.86.063603.
  • Peer Reviewed
• [Journal Article] Spin susceptibility and fluctuation corrections in the BCS-BEC crossover regime of an ultracold Fermi gas (2012)
  • Author(s): T. Kashimura, R. Watanabe, and Y. Ohashi
  • Journal Title: Physical ReviewA Volume: 86巻 Pages: 043622(1-8)
  • DOI: DOI:10.1103/PhysRevA.86.043622
  • Peer Reviewed
• [Journal Article] Pseudogap temperature andeffects of harmonic trap in the BCS-BEC crossover regime of an ultracold Fermi gas (2011)
  • Author(s): S. Tsuchiya, R. Watanabe, and Y. Ohashi
  • Journal Title: Physical ReviewA Volume: 84巻 Pages: 043647(1-11)
  • DOI: DOI:10.1103/PhysRevA.84.043647.
  • Peer Reviewed
• [Journal Article] π-junction and spontaneous current state in a superfluid Fermi gas (2011)
  • Author(s): T. Kashimura, S. Tsuchiya, and Y. Ohashi
  • Journal Title: Physical ReviewA Volume: 84巻 Pages: 013609(1-8)
  • DOI: DOI:10.1103/PhysRevA.84.013609
  • Peer Reviewed
• [Journal Article] Formation of magnetic impurities and pair-breaking effect in a superfluid Fermi gas (2011)
  • Author(s): Y. Ohashi
  • Journal Title: Physical ReviewA Volume: 83巻 Pages: 063611(1-12)
  • DOI: DOI:10.1103/PhysRevA.83.063611
  • Peer Reviewed
• [Journal Article] Superfluid density of states and pseudogap phenomenon in the BCS-BEC crossover regime of a superfluid Fermi gas (2010)
  • Author(s): R. Watanabe, S. Tsuchiya, and Y. Ohashi
  • Journal Title: Physical ReviewA Volume: 82巻 Pages: 043630(1-9)
  • DOI: DOI:10.1103/PhysRevA.82.043630.
  • Peer Reviewed
• [Journal Article] Photoemission spectrum and effect of inhomogeneous pairing fluctuations in the BCS-BEC crossover regime of an ultracold Fermi gas (2010)
  • Author(s): S. Tsuchiya, R. Watanabe, and Y. Ohashi
  • Journal Title: Physical ReviewA Volume: 82巻 Pages: 033629(1-5)
  • DOI: DOI:10.1103/PhysRevA.82.033629.
  • Peer Reviewed
• [Journal Article] Superfluid-ferromagnet-superfluid junction and π phase in a superfluid Fermi gas (2010)
  • Author(s): T. Kashimura, S. Tsuchiya, and Y. Ohashi
  • Journal Title: Physical ReviewA Volume: 82巻 Pages: 033617(1-9)
  • DOI: DOI:10.1103/PhysRevA.82.033617.
  • Peer Reviewed
• [Presentation] 二次元常流動 Fermi 原子気体の BCS-BEC クロスオーバーにおける photoemission スペクトル (2012)
  • Author(s): 渡邉亮太, 土屋俊二, 大橋洋士
  • Organizer: 日本物理学会
  • Place of Presentation: 横浜国立大学.
  • Year and Date: 2012-09-12
• [Presentation] Magnetic properties and pseudogap phenomenon in an ultracold Fermi gas with population imbalance (2012)
  • Author(s): T. Kashimura, R. Watanabe, Y. Ohashi
  • Organizer: APS March Meeting
  • Place of Presentation: Baltimore, US.
  • Year and Date: 2012-03-21
• [Presentation] フェルミ原子ガスで実現する強相関、強結合超流動:BCS-BEC クロスオーバーと擬ギャップ現象 (2011)
  • Author(s): 大橋洋士
  • Organizer: 日本物理学会
  • Place of Presentation: 弘前大学
  • Year and Date: 2011-09-18
• [Presentation] Anomalous tunneling of spin wave in Heisenberg ferromagnet (2011)
  • Author(s): Y. Kato, S. Watabe, and Y. Ohashi
  • Organizer: 26th international conference on low temperature physics (LT26)
  • Place of Presentation: Beijing international convention center, China
  • Year and Date: 2011-08-13
• [Presentation] π-phase and spontaneous supercurrent induced by pseudo ferromagnet in spin-polarized superfluid Fermi gas (2011)
  • Author(s): T. Kashimura, S. Tsuchiya, and Y. Ohashi
  • Organizer: 26th international conference on low temperature physics (LT26)
  • Place of Presentation: Beijing international convention center, China
  • Year and Date: 2011-08-12
• [Presentation] Formation of magnetic impurities, π-junction, and a spontaneous current in a superfluid Fermi gas (2011)
  • Author(s): Y. Ohashi
  • Organizer: GriffinFest
  • Place of Presentation: Toronto University, Canada
  • Year and Date: 2011-05-14
• [Presentation] Phosotemission spectrum and pseudogap phenomena in the BCS-BEC crossover regime of an ultracold Fermi gas (2010)
  • Author(s): 大橋洋士、土屋俊二、渡邉亮太、猪谷太輔
  • Organizer: 第18回渦糸物理国内会議(VPWJ2010)
  • Place of Presentation: 日本原子力開発機構システム計算科学センター、東京
  • Year and Date: 2010-12-01
• [Presentation] Pseudogap behavior of a ultracold Fermi gas in the BCS-BEC crossover regime (2010)
  • Author(s): S. Tsuchiya, R. Watanabe, and Y. Ohashi
  • Organizer: 11th Asia Pacific Physics Conference (APPC11)
  • Place of Presentation: Shanghai Everbright Convention and Exhibition Center, China
  • Year and Date: 2010-11-15
• [Remarks] 研究成果データベース
  • URL: http://k-ris.keio.ac.jp/Profiles/0170/0012288/profile.html