Multistability and Critical Fluctuation in a Split Bose—Einstein COndensate  

作　　者：WUYing SUNChang-Pu 

机构地区：[1]NationalKeyLaboratoryforLaserTechnique,HuazhongUniversityofScienceandTechnology,Wuhan430074,China [2]InstituteofTheoreticalPhysics,theChineseAcademyofSciences,Beijing100080,China

出　　处：《Communications in Theoretical Physics》2002年第6X期675-678,共4页理论物理通讯（英文版）

基　　金：国家自然科学基金，中国科学院资助项目

摘　　要：By using a two-mode description, we show that there exist the multistability, phase transition and associatedcritical fluctuations in the macroscopic tunnelling process between the halves of a double-well trap containing a Bose-Einstein condensate. The phase transition that two of the triple stable states and an unstable state merge into one stablestate or a reverse process takes place whenever the ratio of the mean field energy per particle to the tunnelling energygoes across a critical value of order one. The critical fluctuation phenomenon corresponds to squeezed states for thephase difference between the two wells accompanying with large fluctuations of atom numbers.

关 键 词：玻色-爱因斯坦凝聚态 临界涨落 稳定性 

分 类 号：O469[理学—凝聚态物理]