Critical correlations in an ultra-cold Bose gas revealed by means of a temporal Talbot-Lau interferometer
- Xiong, Wei
- Zhou, Xiaoji
- Yue, Xuguang
- Chen, Xuzong
- Wu, Biao
- Xiong, Hongwei
DOIAbstract
The transition from a thermal cloud to a Bose-Einstein condensate (BEC) in an interacting ultra-cold Bose gas is a prototype in a universality class of diverse phase transitions. For a trapped ultra-cold Bose gas, we were able to study the critical regime both above and below the critical temperature with a Talbot-Lau interferometer, observing a peak in the correlation length. From this peak, we managed to determine the universal critical exponents for this phase transition as well as the finite-size and interaction corrections to the critical temperature. The results are all in quantitative agreement with theory. This work demonstrates the potential application of the Talbot-Lau interferometer to a wide range of critical phase transitions ...
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