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Evolution of the vortex state in the BCS-BEC crossover of a quasi two-dimensional superfluid Fermi gas
Luo, Xuebing; Zhou, Kezhao; Zhang, Zhidong
Corresponding AuthorZhou, Kezhao(kezhaozhou@gmail.com)
2016-11-01
Source PublicationCHINESE PHYSICS B
ISSN1674-1056
Volume25Issue:11Pages:5
AbstractWe 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.
Keywordultra-cold quantum gases superconductivity/superfluidity vortex BCS-BEC crossover
Funding OrganizationNational Natural Science Foundation of China ; Project of Chinese Academy of Sciences
DOI10.1088/1674-1056/25/11/110306
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000390376900007
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/123510
Collection中国科学院金属研究所
Corresponding AuthorZhou, Kezhao
AffiliationChinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
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.
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