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An Empirical Formula for the Measurement of Spatial Coherence of Trapped Bose Gases |
| ZHOU Xiao-Ji1,4;CHEN Shuai2,4;WANG Yi-Qiu1,4;CHEN Xu-Zong1,4;ZHANG Jian-Wei3,4 |
| 1Department of Electronics, Peking University, Beijing 100871
2Department of Physics,Peking University, Beijing 100871
3Department of Technical Physics, Peking University, Beijing 100871
4Key Laboratory for Quantum Information and Measurements, Education Ministry of China |
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| Cite this article: |
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ZHOU Xiao-Ji, CHEN Shuai, WANG Yi-Qiu et al 2001 Chin. Phys. Lett. 18 479-481 |
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Abstract 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.
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03.75.Fi
05.30.Jp
32.80.Pj
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Published: 01 April 2001
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