Noisy dynamics of a vortex in a partially Bose-Einstein condensed gas
Noisy dynamics of a vortex in a partially Bose-Einstein condensed gas
复制标题
部分玻色-爱因斯坦凝聚气体中涡旋的噪声动力学
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
H. Stoof
中科院分区：
文献类型：
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作者：
R. Duine;B. Leurs;H. Stoof
我们研究了部分玻色-爱因斯坦凝聚原子气体中直线涡旋线的动力学。利用变分方法推导了描述非零度凝结水动力学的随机场方程，导出了涡旋核位置的随机运动方程。利用这些结果，我们计算出涡旋从凝结水中螺旋出来所需的时间。由于我们在描述中包含了热波动这一事实，即使涡旋的初始位置在凝结水的中心，它的寿命也是有限的。
We study the dynamics of a straight vortex line in a partially Bose-Einstein condensed atomic gas. Using a variational approach to the stochastic field equation that describes the dynamics of the condensate at nonzero temperature, we derive the stochastic equations of motion for the position of the vortex core. Using these results, we calculate the time it takes the vortex to spiral out of the condensate. Due to the fact that we include thermal fluctuations in our description, this lifetime of the vortex is finite even if its initial position is in the center of the condensate.