Stationary States and Modulational Instability of Coupled Two-Component Bose–Einstein Condensates in a Ring Trap  

作　　者：邓海明 钟宏华 黄嘉豪 代慧 姚敏 黄小益 

机构地区：[1]School of Electronic Information and Electrical Engineering, Xiangnan University [2]School of Physics and Engineering, Sun Yat-sen University [3]Department of Physics, Jishou University

出　　处：《Communications in Theoretical Physics》2015年第8期133-138,共6页理论物理通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No.11465008;the Hunan Provincial Natural Science Foundation under Grant No.2015JJ2114;the Scientific Research Fund of Hunan Provincial Education Department under Grant Nos.14A118,13C881;Science and Technology Innovative Research Team in Higher Educational Instituions of Hunan Province;Science Research Foundation of Xiangnan University under Grant No.2012–126(41)

摘　　要：We investigate modulational instability(MI) of a coupled two-component Bose–Einstein condensates in a rotating ring trap. The excitation spectrum and the MI condition of the system are presented analytically. We find that the coupling between the two components strongly modifies the MI condition, and the MI condition is phase-dependent.Furthermore, we discuss the effect of MI on both density excitation and spin excitation. If the inter- and intra-component interaction strengths are all equal, the MI causes density excitation but not spin excitation, and if the inter- and intracomponent interaction strengths are different, the MI causes both density excitation and spin excitation. Our results provide a promising approach for controlling the stability and excitation of a rotating two-component Bose–Einstein condensates by modulating its coupling strength and interaction strength.We investigate modulational instability(MI) of a coupled two-component Bose–Einstein condensates in a rotating ring trap. The excitation spectrum and the MI condition of the system are presented analytically. We find that the coupling between the two components strongly modifies the MI condition, and the MI condition is phase-dependent.Furthermore, we discuss the effect of MI on both density excitation and spin excitation. If the inter- and intra-component interaction strengths are all equal, the MI causes density excitation but not spin excitation, and if the inter- and intracomponent interaction strengths are different, the MI causes both density excitation and spin excitation. Our results provide a promising approach for controlling the stability and excitation of a rotating two-component Bose–Einstein condensates by modulating its coupling strength and interaction strength.

关 键 词：TWO-COMPONENT Bose–Einstein CONDENSATES modulation 

分 类 号：O469[理学—凝聚态物理]