Cross-over to quasi-condensation: mean-field theories and beyond
Cross-over to quasi-condensation: mean-field theories and beyond
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DOI：
10.1088/1361-6455/aa6888
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发表时间：
2017-01
期刊：
影响因子：
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通讯作者：
C. Henkel;Tim-O. Sauer;Tim-O. Sauer;N. Proukakis
中科院分区：
文献类型：
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作者：
C. Henkel;Tim-O. Sauer;Tim-O. Sauer;N. Proukakis
我们分析了一个均匀的，弱相互作用的玻色气体在一维从理想气体到稠密的准凝析相的交叉。我们回顾了一些平均场理论，微扰或自洽，并提供准确的评估状态方程，密度波动，和相关函数。一个光滑的交叉再现经典场模拟的基础上的随机Gross-Pitaevskii方程和杨-杨解决方案的一维玻色气体。
We analyze the cross-over of a homogeneous, weakly interacting Bose gas in one dimension from the ideal gas into the dense quasi-condensate phase. We review a number of mean-field theories, perturbative or self-consistent, and provide accurate evaluations of equation of state, density fluctuations, and correlation functions. A smooth crossover is reproduced by classical-field simulations based on the stochastic Gross–Pitaevskii equation and the Yang–Yang solution to the one-dimensional Bose gas.