Transport of ultracold Bose gases beyond the Gross-Pitaevskii description
Transport of ultracold Bose gases beyond the Gross-Pitaevskii description
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超出 Gross-Pitaevskii 描述的超冷玻色气体的传输
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
P. Schlagheck
中科院分区：
文献类型：
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作者：
T. Ernst;T. Paul;P. Schlagheck
我们探讨了超冷玻色凝聚原子蒸气在Gross-Pitaevskii平均场理论之外的介观波导结构中的类原子激光输运过程。基于微观描述的运输过程中存在的一个相干源，模型从一个水库的完美玻色-爱因斯坦凝聚原子的耦合，我们推导出一个系统的耦合量子演化方程，描述了一个稀释的凝聚玻色气体的动力学的Hartree-Fock-Bogoliubov近似的框架。我们应用这种方法研究了稀玻色气体通过原子量子点和无序波导的输运。我们的数值模拟表明，一个明确的时间依赖性流的发病对应于在微观水平上的凝聚体的强烈耗尽的外观，并导致全球相位相干性的损失。
We explore atom-laser-like transport processes of ultracold Bose-condensed atomic vapors in mesoscopic waveguide structures beyond the Gross-Pitaevskii mean-field theory. Based on a microscopic description of the transport process in the presence of a coherent source that models the outcoupling from a reservoir of perfectly Bose-Einstein condensed atoms, we derive a system of coupled quantum evolution equations that describe the dynamics of a dilute condensed Bose gas in the framework of the Hartree-Fock--Bogoliubov approximation. We apply this method to study the transport of dilute Bose gases through an atomic quantum dot and through waveguides with disorder. Our numerical simulations reveal that the onset of an explicitly time-dependent flow corresponds to the appearance of strong depletion of the condensate on the microscopic level and leads to a loss of global phase coherence.