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Gentaro Watanabe
복잡계 이론물리 연구단
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Multiple period states of the superfluid Fermi gas in an optical lattice

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Title
Multiple period states of the superfluid Fermi gas in an optical lattice
Author(s)
Sukjin Yoon; Franco Dalfovo; Takashi Nakatsukasa; Gentaro Watanabe
Publication Date
2016-02
Journal
NEW JOURNAL OF PHYSICS, v.18, no.2, pp.023011 -
Publisher
IOP PUBLISHING LTD
Abstract
Westudy multiple period states of a two-component unpolarized superfluid Fermi gas in an optical lattice along the Bardeen–Cooper–Schrieffer (BCS) to Bose–Einstein condensate (BEC) crossover. The existence of states whose period is a multiple of the lattice spacing is a direct consequence of the nonlinear behavior of the gas, which is due to the presence of the order parameter associated with superfluidity. 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, in sharp contrast to the situation in BECs. ©2016 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft
URI
http://pr.ibs.re.kr/handle/8788114/2374
DOI
10.1088/1367-2630/18/2/023011
ISSN
1367-2630
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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