%0 Journal Article
%T Self-trapping and its periodic modulation of Bose-Einstein condensates in double-well trap<br>双势阱玻色-爱因斯坦凝聚体系的自俘获现象及其周期调制效应
%A Wang Guan-Fang
%A Fu Li-Bin
%A Zhao Hong
%A Liu Jie
%A <br>王冠芳
%A 傅立斌
%A 赵 鸿
%A 刘 杰
%J 物理学报
%D 2005
%I 
%X Self-trapping of Bose-Einstein condensates (BEC) in double-well trap is investigated. Two kinds of self-trapping are discussed through phase space analysis in the mean-field approximation: 1) The number of atoms oscillates near an equilibrium point in the phase space, while relative phase increases monotonously with time (running-phase); 2) Both the number of particles and the relative phase oscillate near an equilibrium point in the phase space. In particular, we investigate how an external periodic filed influence the self-trapping. It is found that the external periodic field may dramatically modulate the critical points at which the transition to self-trapping occurs. With this, we can observe self-trapping phenomenon in a dilute Bose-Einstein condensate with a very weak interaction as well. Finally, the effect of many-body quantum fluctuation on self-trapping is also studied. We also discuss how to observe the self-trapping phenomenon with present experimental techniques.
%K Bose-Einstein condensate (BEC)
%K self-trapping
%K double-well
%K periodic modulation<br>玻色-爱因斯坦凝聚，
%K 自俘获，
%K 双势阱，
%K 周期调制
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=AB8143402167BED0&yid=2DD7160C83D0ACED&vid=318E4CC20AED4940&iid=708DD6B15D2464E8&sid=2ECF41CD6DA21378&eid=919820FAFD59AB35&journal_id=1000-3290&journal_name=物理学报&referenced_num=5&reference_num=47