International Conference on the Frontiers in Atomic, Molecular, and Optical Physics 2016 | |
Multiple Period States of the Superfluid Fermi Gas in an Optical Lattice | |
Watanabe, Gentaro^1,2 ; Yoon, Sukjin^3 ; Dalfovo, Franco^4 ; Nakatsukasa, Takashi^5,6 | |
Department of Physics, Zhejiang Institute of Modern Physics, Zhejiang University, Hangzhou, Zhejiang | |
310027, China^1 | |
Center for Theoretical Physics of Complex Systems, Institute for Basic Science (IBS), Daejeon | |
34051, Korea, Republic of^2 | |
School of Computational Sciences, Korea Institute for Advanced Study (KIAS), Seoul | |
02455, Korea, Republic of^3 | |
INO-CNR BEC Center and Department of Physics, University of Trento, Povo | |
38123, Italy^4 | |
Center for Computational Sciences, University of Tsukuba, Tsukuba | |
305-8577, Japan^5 | |
RIKEN Nishina Center, Wako, Saitama | |
351-0198, Japan^6 | |
关键词: Bardeen-Cooper-Schrieffer; Bogoliubov-de Gennes equations; Bose-Einstein condensates; Dynamical instabilities; Sharp contrast; Superfluid Fermi gas; Superfluid flows; Survival time; | |
Others : https://iopscience.iop.org/article/10.1088/1742-6596/752/1/012002/pdf DOI : 10.1088/1742-6596/752/1/012002 |
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来源: IOP | |
【 摘 要 】
We study multiple period states (i.e., states whose period is a multiple of the lattice constant) of a two-component unpolarized superfluid Fermi gas in an optical lattice along the crossover between the Bardeen-Cooper-Schrieffer (BCS) and Bose-Einstein condensate (BEC) states. By solving Bogoliubov-de Gennes equations for a superfluid flow with finite quasimomentum, we find that, in the BCS side of the crossover, the multiple period states can be energetically favorable compared to the normal Bloch states and their survival time against dynamical instability drastically increases, suggesting that these states can be accessible in current experiments. This is in sharp contrast to the situation in BECs.
【 预 览 】
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