Tunneling and Self-Trapping of Superfluid Fermi Gases in BCS-BEC Crossover

作     者：周昱 王颖 罗文琛 马晓栋 

作者机构：Department of PhysicsJiangsu University of Science and Technology Department of PhysicsEast China Normal University Departement de PhysiqueUniversite de SherbrookeSherbrookeQuebec J1K 2R1Canada Department of PhysicsXinjiang Normal UniversityUrumuchi 830054China 

出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)

年 卷 期：2012年第57卷第2期

页      面：188-194页

核心收录：

学科分类：080705[工学-制冷及低温工程] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0807[工学-动力工程及工程热物理] 0702[理学-物理学] 

基　　金：Supported by Supported by National Natural Science Foundation of China under Grant Nos. 10864006,11047101,11091240227,and11105039 by Ph.D. Program Scholarship Fund of East China Normal University under Grant No. 20080044 by Research Fund of Jiangsu University of Science and Technology under Grant No. 35051002 

主　　题：BCS-BEC crossover Josephson effect macroscopic quantum self-trapping 

摘      要：We investigate tunneling and self-trapping of superfluid Fermi gases under a two-mode ansatz in different regimes of the crossover from Bardeen-Cooper-Schrieffer （BCS） superfluid to Bose-Einstein condensates （BEC）. Starting from a generalized equation of state, we derive the coupled equations of relative atom-pair number and relative phase about superfluid Fermi gases in a double-well system and then classify the different oscillation behaviors by the tunneling strength and interactions between atoms. Tunneling and self-trapping behaviors are considered in the whole BCS-BEC crossover in the ease of a symmetric double-well potential. We show that the nonlinear interaction between atoms makes the self-trapping more easily realized in BCS regime than in the BEC regime and stability analysis is also given.