Matter wave interference of dilute Bose gases in the critical regime  

作　　者：乐旭广 刘淑娟 吴飙 熊宏伟 

机构地区：[1]Wilczek Quantum Center, Zhejiang University of Technology, Hangzhou 310023, China [2]Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China [3]International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China [4]Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

出　　处：《Chinese Physics B》2017年第5期66-70,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11504328,11274024,and 11334001);the National Basic Research Program of China(Grants Nos.2013CB921903 and 2012CB921300)

摘　　要：Ultra-cold atomic gases provide a new chance to study the universal critical behavior of phase transition. We study theoretically the matter wave interference for ultra-cold Bose gases in the critical regime. We demonstrate that the interference in the momentum distribution can be used to extract the correlation in the Bose gas. A simple relation between the interference visibility and the correlation length is found and used to interpret the pioneering experiment about the critical behavior of dilute Bose gases [Science 315 1556（2007）]. Our theory paves the way to experimentally study various types of ultra-cold atomic gases with the means of matter wave interference.Ultra-cold atomic gases provide a new chance to study the universal critical behavior of phase transition. We study theoretically the matter wave interference for ultra-cold Bose gases in the critical regime. We demonstrate that the interference in the momentum distribution can be used to extract the correlation in the Bose gas. A simple relation between the interference visibility and the correlation length is found and used to interpret the pioneering experiment about the critical behavior of dilute Bose gases [Science 315 1556（2007）]. Our theory paves the way to experimentally study various types of ultra-cold atomic gases with the means of matter wave interference.

关 键 词：gases dilute regime momentum universal visibility pioneering chance coherence assume 

分 类 号：O431.2[机械工程—光学工程]