异核两组分玻色-爱因斯坦凝聚体中暗孤子的形成及其性质  

Generation and Properties of Dark Solitons in Heteronuclear Two-component Bose-Einstein Condensates

作　　者：周艳珍[1] 张素英[1] 韩伟[1] 

机构地区：[1]山西大学理论物理研究所,山西太原030006

出　　处：《计算物理》2012年第1期145-151,共7页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(10972125);山西省自然科学基金(2010011001-2);山西省留学回国人员科研基金资助项目

摘　　要：数值模拟准一维异核两组分玻色-爱因斯坦凝聚体在谐振子势阱中的运动,研究调制不稳定性条件(MI条件)下暗孤子的形成及其性质.在调制不稳定性条件下,凝聚体基态形成后,瞬间使组分间的相互排斥力变为相互吸引力,实时演化可以形成暗孤子.对各组分自身相互作用系数分析发现,它们之间满足一定关系时暗孤子在不同的组分内形成,而且形成的暗孤子在谐振子势阱中呈现周期性的往返对穿运动.讨论了形成暗孤子数目与两种粒子的质量比率和粒子数比率存在的关系.Generation and properties of dark solitons are studied in detail by means of numerical simulation of quasi one-dimensional heteronuclear two-component Bose-Einstein condensates in syntonic potential. Dark solitons are only induced in one of the condensate components by modulational instability with instantaneous conversion of repulsive interspecies interaction to attraction. Solitons pass through each other periodically in syntonie potential. In addition, the number of dark solitons is affiliated with ratio of particle mass and ratio of particles numbers.

关 键 词：调制不稳定性条件 暗孤子 粒子质量 粒子数 

分 类 号：O469[理学—凝聚态物理]