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首页> 外文期刊>Physical Review, A. Atomic, molecular, and optical physics >Phase transition to Bose-Einstein condensation for a bosonic gas confined in a combined trap
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Phase transition to Bose-Einstein condensation for a bosonic gas confined in a combined trap

机译：封闭在联合捕集阱中的玻色气体的相变转变为玻色-爱因斯坦凝聚

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摘要

We present a study of phase transition to macroscopic superfluidity for an ultracold bosonic gas confined in a combined trap formed by a one-dimensional optical lattice and a harmonic potential, focusing on the critical temperature of this system and the interference patterns of the Bose gas released from the combined trap. Based on a semiclassical energy spectrum, we develop an analytic approximation for the critical temperature T_c, and compare the analytic results with that obtained by numerical computations. For finite temperatures below T_c, we calculate the interference patterns for both the normal gas and the superfluid gas. The total interference pattern shows a feature of "peak on a peak." As a comparison, we also present the experimentally observed interference patterns of ~(87)Rb atoms released from a one-dimensional optical lattice system in accord with our theoretical model. Our observations are consistent with the theoretical results.
机译：我们目前研究的是由一维光学晶格和高次谐波电势形成的联合陷阱中局限的超冷硼气体的相变到宏观超流动性，重点是该系统的临界温度和释放的玻色气体的干涉图样。从联合陷阱。基于半经典能谱，我们对临界温度T_c进行了解析近似，并将解析结果与通过数值计算获得的解析结果进行了比较。对于低于T_c的有限温度，我们计算正常气体和超流体气体的干涉图样。总干涉图样显示出“峰峰值”的特征。作为比较，我们还提供了从实验观察到的从一维光学晶格系统释放的〜（87）Rb原子的干涉​​图，与我们的理论模型一致。我们的观察与理论结果一致。

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