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首页> 外文期刊>Physica, B. Condensed Matter >Hydrodynamic approach to vortex stability in trapped Bose condensates
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Hydrodynamic approach to vortex stability in trapped Bose condensates

机译:束缚Bose冷凝物中涡旋稳定性的流体力学方法

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摘要

We study a vortex in a two-dimensional, harmonically trapped Bose-Einstein condensate at zero temperature. Through a variational calculation using a trial condensate wave function and a nonlinear Schrodinger (or Gross-Pitaevskii) Lagrangian, we obtain the effective potential experienced by a vortex at an arbitrary position in the condensate, and find that an off-center vortex will move in a circular trajectory around the trap center. The frequency of this precession is too small to excite any modes in the cloud, and thus the vortex appears dynamically more stable than predicted by a classical continuous model. The lifetime of a vortex in a trapping potential which is not perfectly cylindrically symmetric is also considered. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 9]
机译:我们在零温度下研究二维,谐波捕获的玻色-爱因斯坦凝聚物中的涡旋。通过使用试验凝结水波函数和非线性Schrodinger(或Gross-Pitaevskii)拉格朗日算子的变分计算,我们获得了凝结水在任意位置涡旋所经历的有效电势,并发现偏心涡旋将在陷阱中心周围的圆形轨迹。旋进的频率太小,无法激发云中的任何模式,因此,涡旋比经典连续模型所预测的动态更稳定。还考虑了不是完全圆柱形对称的俘获势中涡旋的寿命。 (C)2000 Elsevier Science B.V.保留所有权利。 [参考:9]

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