セミナー情報

原子力機構・兵県大合同物性コロキウム(第68回)

日時: 平成22年6月10日(木) 16:00〜
Date and time: 10th Jun. (Thu.) 16:00〜
場所: SPring-8, 萌光館
Place: SPring-8, "HOUKOUKAN" seminar room
Title: Angular Fulde-Ferrell-Larkin-Ovchinnikov state in cold Fermi gases near BCS-BEC crossover
講演者: 柳瀬陽一 (新潟大学自然科学系)
Speaker: Prof. Yoichi Yanase (Niigata University)
Abstract:

I will talk about the angular Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state with broken rotation symmetry in population imbalanced Fermi gases near the BCS-BEC crossover [1]. Combining the Bogoliubov-de Gennes equation with the self-consistent T-matrix approximation beyond the local-density approximation, we examine the stability of the angular FFLO state. We show that the angular FFLO state is stabilized in the gases confined in the toroidal trap but not in the harmonic trap. The angular FFLO state is stable against the fluctuation near the BCS-BEC crossover by forming the pseudogap.

I discuss the spatial dependences of number density and local population imbalance for an experimental test. The giant responses to the rotation will be shown as a unique manifestation of the angular FFLO state. The current interests on the FFLO superfluid in cold Fermi gases will be illuminated by comparing it with the FFLO superconductivity in strongly correlated electron systems, such as CeCoIn5 [2].

[1] Y. Yanase: Phys. Rev. B 80 (2009) 220510(R) .
[2] Y. Yanase and M. Sigrist: J. Phys. Soc. Jpn. 78 (2009) 114715.