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arXiv 1608.04693cond-mat.quant-gasphysics.atom-ph
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相互作用玻色气体中热损耗和量子损耗的动量分辨观测

Momentum-resolved observation of thermal and quantum depletion in an interacting Bose gas

R. Chang, Q. Bouton, H. Cayla, C. Qu, A. Aspect, C. I. Westbrook, D. Clément

摘要:

我们报告的单原子分辨测量动量分布$\hbar k$在弱相互作用玻色气体后,330毫秒的飞行时间。我们调查它的各种温度,并清楚地分开两个贡献耗尽的冷凝物的$k$依赖性。第一个是热损耗。第二个贡献下降为$k^{-4}$,其大小随着阱内冷凝密度的增加而增加,正如Bogoliubov理论在零温度下所预测的那样。这些观察表明它与量子损耗有关。这种贡献如何在释放的相互作用凝聚物的膨胀中幸存下来是一个有趣的开放问题。

英文摘要:

We report on the single-atom-resolved measurement of the distribution of momenta $\hbar k$ in a weakly interacting Bose gas after a 330 ms time-of-flight. We investigate it for various temperatures and clearly separate two contributions to the depletion of the condensate by their $k$-dependence. The first one is the thermal depletion. The second contribution falls of as $k^{-4}$, and its magnitude increases with the in-trap condensate density as predicted by the Bogoliubov theory at zero temperature. These observations suggest associating it with the quantum depletion. How this contribution can survive the expansion of the released interacting condensate is an intriguing open question.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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