Evolution of the vortex state in the BCS-BEC crossover of a quasi two-dimensional superfluid Fermi gas

doi:10.1088/1674-1056/25/11/110306

IMR OpenIR

	Evolution of the vortex state in the BCS-BEC crossover of a quasi two-dimensional superfluid Fermi gas
	Luo, Xuebing; Zhou, Kezhao; Zhang, Zhidong
通讯作者	Zhou, Kezhao(kezhaozhou@gmail.com)
	2016-11-01
发表期刊	CHINESE PHYSICS B
ISSN	1674-1056
卷号	25 期号:11 页码:5
摘要	We use the path-integral formalism to investigate the vortex properties of a quasi-two dimensional (2D) Fermi superfluid system trapped in an optical lattice potential. Within the framework of mean-field theory, the cooper pair density, the atom number density, and the vortex core size are calculated from weakly interacting BCS regime to strongly coupled while weakly interacting BEC regime. Numerical results show that the atoms gradually penetrate into the vortex core as the system evolves from BEC to BCS regime. Meanwhile, the presence of the optical lattice allows us to analyze the vortex properties in the crossover from three-dimensional (3D) to 2D case. Furthermore, using a simple re-normalization procedure, we find that the two-body bound state exists only when the interaction is stronger than a critical one denoted by G(c) which is obtained as a function of the lattice potential's parameter. Finally, we investigate the vortex core size and find that it grows with increasing interaction strength. In particular, by analyzing the behavior of the vortex core size in both BCS and BEC regimes, we find that the vortex core size behaves quite differently for positive and negative chemical potentials.
关键词	ultra-cold quantum gases superconductivity/superfluidity vortex BCS-BEC crossover
资助者	National Natural Science Foundation of China ; Project of Chinese Academy of Sciences
DOI	10.1088/1674-1056/25/11/110306
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51331006] ; National Natural Science Foundation of China[51590883] ; National Natural Science Foundation of China[11204321] ; Project of Chinese Academy of Sciences[KJZD-EW-M05-3]
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:000390376900007
出版者	IOP PUBLISHING LTD
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/123510
专题	中国科学院金属研究所
通讯作者	Zhou, Kezhao
作者单位	Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Luo, Xuebing,Zhou, Kezhao,Zhang, Zhidong. Evolution of the vortex state in the BCS-BEC crossover of a quasi two-dimensional superfluid Fermi gas[J]. CHINESE PHYSICS B,2016,25(11):5.
APA	Luo, Xuebing,Zhou, Kezhao,&Zhang, Zhidong.(2016).Evolution of the vortex state in the BCS-BEC crossover of a quasi two-dimensional superfluid Fermi gas.CHINESE PHYSICS B,25(11),5.
MLA	Luo, Xuebing,et al."Evolution of the vortex state in the BCS-BEC crossover of a quasi two-dimensional superfluid Fermi gas".CHINESE PHYSICS B 25.11(2016):5.