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arXiv 0705.1226cond-mat.other
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平衡玻色气体的半经典场方法及其在二维热涡旋中的应用

A semi-classical field method for the equilibrium Bose gas and application to thermal vortices in two dimensions

Luca Giorgetti, Iacopo Carusotto, Yvan Castin

摘要:

本文发展了一种研究有限温度下弱相互作用玻色气体的半经典场方法,与通常的经典场模型相反,这种方法不受紫外截止效应的影响。我们应用的方法来研究在空间均匀的,二维系统的热涡。我们提出了涡密度和涡对分布函数的数值结果。通过将数值结果与简单分析模型的预测进行比较,可以深入了解系统的物理特性。特别地,我们计算了在低温下形成涡旋对所需的激活能。

英文摘要:

We develop a semi-classical field method for the study of the weakly interacting Bose gas at finite temperature, which, contrarily to the usual classical field model, does not suffer from an ultraviolet cut-off dependence. We apply the method to the study of thermal vortices in spatially homogeneous, two-dimensional systems. We present numerical results for the vortex density and the vortex pair distribution function. Insight in the physics of the system is obtained by comparing the numerical results with the predictions of simple analytical models. In particular, we calculate the activation energy required to form a vortex pair at low temperature.

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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