Vortex dynamics in trapped Bose-Einstein condensate

被引：28

作者：

Madarassy, Eniko J. M. ^{[1
]}

Barenghi, Carlo F. ^{[1
]}

机构：

[1] Newcastle Univ, Sch Math, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 2008年 / 152卷 / 3-4期

基金：

英国工程与自然科学研究理事会;

关键词：

quantized vortices; Bose-Einstein condensate; dissipation; vortex dynamics;

D O I：

10.1007/s10909-008-9811-9

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We perform numerical simulations of vortex motion in a trapped Bose-Einstein condensate by solving the two-dimensional Gross-Pitaevskii Equation in the presence of a simple phenomenological model of interaction between the condensate and the finite temperature thermal cloud. At zero temperature, the trajectories of a single, off-centred vortex precessing in the condensate, and of a vortex-antivortex pair orbiting within the trap, excite acoustic emission. At finite temperatures the vortices move to the edge of the condensate and vanish. By fitting the finite-temperature trajectories, we relate the phenomenological damping parameter to the friction coefficients alpha and alpha', which are used to describe the interaction between quantised vortices and the normal fluid in superfluid helium.

引用

页码：122 / 135

页数：14

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