Measurement of Critical correlations in an ultracold Bose gas by means of a temporal Talbot-Lau interferometery

28th International Conference on Photonic, Electronic and Atomic Collisions

Chen, Xuzong^1 ; Xiong, Wei^1 ; Zhai, Yueyang^1 ; Yue, Xuguang^1 ; Wu, Biao^2 ; Xiong, Hongwei^3,4 ; Zhou, Xiaoji^1

School of Electronics Engineering and Computer Science, Peking University, Beijing

100871, China^1

International Center for Quantum Materials, Peking University, Beijing

100871, China^2

State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan

430071, China^3

Department of Applied Physics, Zhejiang University of Technology, Hangzhou

310023, China^4

关键词: Bose gas;    Correlation lengths;    Critical exponent;    Critical temperatures;    Phase transition point;    Quantum gas;    Thermal cloud;    Ultra-cold;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/488/1/012026/pdf
DOI  :  10.1088/1742-6596/488/1/012026

来源: IOP

【 摘 要 】

We report the results of a study of measuring the correlation length at the Lambda critical phase transition point in an ultra-cold Bose gas with a temporal Talbot-Lau (TL) interferometery. Near the critical temperature, the correlation length increase exponentially and its critical exponent factor is measured around 0.67, which is a universal value in quantum gas. In the experiment we filtered the fraction of condensate from the thermal cloud at the Lambda critical phase transition point by means of the TL interferometer technique.