Ultracold Fermi gas in a single-mode cavity: Cavity-mediated interaction and BCS-BEC evolution

doi:10.1103/PhysRevA.86.053605

	Ultracold Fermi gas in a single-mode cavity: Cavity-mediated interaction and BCS-BEC evolution
	Guo, Xiaoyong 1; Ren, Zhongzhou 1,2; Guo, Guangjie 1; Peng, Jie 1
刊名	PHYSICAL REVIEW A
	2012-11-07
卷号	86
ISSN号	1050-2947
DOI	10.1103/PhysRevA.86.053605
文献子类	Article
英文摘要	We propose that the evolution of superfluidity from the Bardeen-Cooper-Schrieffer (BCS) regime to the Bose-Einstein condensation (BEC) regime can be realized using ultracold Fermi gas coupled to a single-mode cavity. By the functional integral formalism, we derive an effective atom-only action, which mimics the two-component Fermi gas with tunable two-body interaction. First, we address the features of the cavity-mediated interaction. We find that the matter-light coupling creates an effective s-wave scattering whose sign and amplitude are controlled by parameters of the cavity. Second, we discuss the fermionic superfluidity on the mean-field level, including the order parameter, chemical potential, quasiparticle excitation spectrum, momentum distribution, and dissociation temperature. It is shown that by varying the atom-cavity detuning, a BCS to BEC crossover occurs. In addition, the influences of the atomic collaborative effect and external pumping field on the pairing correlation are also studied.
资助项目	Research Fund of Doctoral Point (RFDP)[20100091110028]
WOS关键词	BOSE-EINSTEIN CONDENSATE ; PHASE-SEPARATION ; OPTICAL CAVITY ; CROSSOVER ; SUPERCONDUCTIVITY ; TRANSITION
WOS研究方向	Optics ; Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000310838600008
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/49109]
专题	中国科学院近代物理研究所
通讯作者	Guo, Xiaoyong
作者单位	1.Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China 2.Ctr Theoret Nucl Phys, Natl Lab Heavy Ion Accelerator, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Guo, Xiaoyong,Ren, Zhongzhou,Guo, Guangjie,et al. Ultracold Fermi gas in a single-mode cavity: Cavity-mediated interaction and BCS-BEC evolution[J]. PHYSICAL REVIEW A,2012,86.
APA	Guo, Xiaoyong,Ren, Zhongzhou,Guo, Guangjie,&Peng, Jie.(2012).Ultracold Fermi gas in a single-mode cavity: Cavity-mediated interaction and BCS-BEC evolution.PHYSICAL REVIEW A,86.
MLA	Guo, Xiaoyong,et al."Ultracold Fermi gas in a single-mode cavity: Cavity-mediated interaction and BCS-BEC evolution".PHYSICAL REVIEW A 86(2012).