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arXiv 1210.7993cond-mat.quant-gasmath-phmath.MP
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有限温度玻色气体中可观测的涡旋性质

Observable Vortex Properties in Finite Temperature Bose Gases

A. J. Allen, E. Zaremba, C. F. Barenghi, N. P. Proukakis

摘要:

我们研究了有限温度原子玻色-爱因斯坦凝聚体中涡旋的动力学,重点关注衰变率、进动频率和核心亮度,这是由最近的实验(Freilich等人,Science 329,1182(2010))激发的,在该实验中观察到单个涡旋的实时动力学。使用ZNG形式主义的基础上的耗散Gross-Pitaevskii方程的冷凝物耦合到一个半经典的玻尔兹曼方程的热云,我们发现一个快速的非线性增加的衰减率和进动频率随着温度的升高。这种增加是由动态凝聚-热耦合决定的,也取决于固有的热云碰撞动力学;岁差频率也随初始径向坐标而变化。涡核中的积分热云密度在很大程度上与涡的位置无关(除了当它靠近冷凝物边缘时),其值随温度而增加。这可以潜在地用作Coddington等人(Phys.Rev.A70,063607(2004))的方法的变体,用于实验性地确定温度。

英文摘要:

We study the dynamics of vortices in finite temperature atomic Bose-Einstein condensates, focussing on decay rates, precession frequencies and core brightness, motivated by a recent experiment (Freilich et al. Science 329, 1182 (2010)) in which real-time dynamics of a single vortex was observed. Using the ZNG formalism based on a dissipative Gross-Pitaevskii equation for the condensate coupled to a semi-classical Boltzmann equation for the thermal cloud, we find a rapid nonlinear increase of both the decay rate and precession frequency with increasing temperatures. The increase, which is dominated by the dynamical condensate-thermal coupling is also dependent on the intrinsic thermal cloud collisional dynamics; the precession frequency also varies with the initial radial coordinate. The integrated thermal cloud density in the vortex core is for the most part independent of the position of the vortex (except when it is near the condensate edge) with its value increasing with temperature. This could potentially be used as a variant to the method of Coddington et al. (Phys. Rev. A 70, 063607 (2004)) for experimentally determining the 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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