Spin-orbit coupling effects on the superfluidity of a Fermi gas in an optical lattice

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	Spin-orbit coupling effects on the superfluidity of a Fermi gas in an optical lattice
	Sun, Q ; Zhu, GB ; Liu, WM ; Ji, AC
刊名	PHYSICAL REVIEW A
	2013
卷号	88 期号:6 页码:3637
ISSN号	1050-2947
通讯作者	Sun, Q. (reprint author), Capital Normal Univ, Dept Phys, Beijing 100048, Peoples R China
中文摘要	We investigate the superfluidity of attractive Fermi gas in a square optical lattice with spin-orbit coupling (SOC). We show that the system displays a variety of new features. At half filling, SOC induces a Dirac semimetal and the system undergoes a semimetal-superfluid transition. Near half filling, we find that the superfluidity tends to be suppressed due to the emerging Dirac cones. While for small fillings, SOC can induce a BCS-BEC crossover beyond the conventional attractive Hubbard model, which is characterized by a bound state in the lattices. Moreover, we demonstrate that the superfluid density also exhibits many unusual properties in the lattices.
语种	英语
公开日期	2014-01-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/57462]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Sun, Q,Zhu, GB,Liu, WM,et al. Spin-orbit coupling effects on the superfluidity of a Fermi gas in an optical lattice[J]. PHYSICAL REVIEW A,2013,88(6):3637.
APA	Sun, Q,Zhu, GB,Liu, WM,&Ji, AC.(2013).Spin-orbit coupling effects on the superfluidity of a Fermi gas in an optical lattice.PHYSICAL REVIEW A,88(6),3637.
MLA	Sun, Q,et al."Spin-orbit coupling effects on the superfluidity of a Fermi gas in an optical lattice".PHYSICAL REVIEW A 88.6(2013):3637.