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arXiv 1102.3565cond-mat.quant-gas
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非均匀外势作用下冷态气体的凝结分数

Condensate fraction of cold gases in non-uniform external potential

G. E. Astrakharchik, K. V. Krutitsky

摘要:

精确计算不具有连续对称性的多维非均匀相互作用玻色系统中的凝聚分数是一个困难的计算问题。我们已经开发了一个迭代程序,允许计算凝聚分数以及相应的本征函数的单体密度矩阵。我们成功地验证了这一过程中的扩散蒙特卡罗模拟的玻色气体在光晶格在零温度。我们还讨论了在冷玻色系统中检验相干性的不同判据之间的关系,如超流态、凝聚态和零动量态粒子的分数。

英文摘要:

Exact calculation of the condensate fraction in multi-dimensional inhomogeneous interacting Bose systems which do not possess continuous symmetries is a difficult computational problem. We have developed an iterative procedure which allows to calculate the condensate fraction as well as the corresponding eigenfunction of the one-body density matrix. We successfully validate this procedure in diffusion Monte Carlo simulations of a Bose gas in an optical lattice at zero temperature. We also discuss relation between different criteria used for testing coherence in cold Bose systems, such as fraction of particles that are superfluid, condensed or are in the zero-momentum state.

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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