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arXiv 1009.3170cond-mat.stat-mechcond-mat.quant-gas
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势阱中理想玻色气体的保模随机场方程:数值实现及应用

Norm preserving stochastic field equation for an ideal Bose gas in a trap: numerical implementation and applications

S. Heller, W. T. Strunz

摘要:

随机场方程是描述玻色气体热态的有力工具。通常,这些方法面临着紫外灾难的老问题,这需要在高能量下截止。在[arXiv:0809.1002,Phys. B 42,081001(2009)]中,我们引入了一个量子随机场方程,通过基于Glauber-Sudarshan P函数的全量子方法避免了截止问题。为了与实际的实验装置有密切的联系,该理论是为固定的粒子数而制定的,因此是基于正则系综的。在这项工作中的推导和非平凡的数值实现方程的详细说明。我们提出了有限玻色气体被困在各种潜在的应用,并显示结果的基态占领数和它们的平衡波动。此外,我们还通过研究不同阶数的关联函数来研究空间相干特性。

英文摘要:

Stochastic field equations represent a powerful tool to describe the thermal state of a trapped Bose gas. Often, such approaches are confronted with the old problem of an ultraviolet catastrophe, which demands a cutoff at high energies. In [arXiv:0809.1002, Phys. B 42, 081001 (2009)] we introduce a quantum stochastic field equation, avoiding the cutoff problem through a fully quantum approach based on the Glauber-Sudarshan P-function. For a close link to actual experimental setups the theory is formulated for a fixed particle number and thus based on the canonical ensemble. In this work the derivation and the non-trivial numerical implementation of the equation is explained in detail. We present applications for finite Bose gases trapped in a variety of potentials and show results for ground state occupation numbers and their equilibrium fluctuations. Moreover, we investigate spatial coherence properties by studying correlation functions of various orders.

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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