摘要
An empirical formula,which demonstrates the interference fringe visibility as a function of the slit separation and the temperature of thermal atoms,is obtained by analysing a recent experiment[Bloch et al.Nature 403(2000)166]that refers to the spatial correlation function of a trapped Bose gas below the critical temperature.We find that the decay rate of the coherence function for the non-condensed component is of about two orders larger than that of the pure condensed component.The changes of the interference fringe visibility versus the falling time for different temperatures and slit separations are also discussed.
作者
周小计
陈帅
王义遒
陈徐宗
张建玮
ZHOU Xiao-Ji;CHEN Shuai;WANG Yi-Qiu;CHEN Xu-Zong;ZHANG Jian-Wei(Department of Electronics,Peking University,Beijing 100871;Department of Physics,Peking University,Beijing 100871;Department of Technical Physics,Peking University,Beijing 100871;Key Laboratory for Quantum Information and Measurements,Education Ministry of China)
基金
Supported by Important Program for Scientific Research,Education Ministry of China under Grant No.00-09.
