Damping of condensate collective modes due to equilibration with the noncondensate
Damping of condensate collective modes due to equilibration with the noncondensate
复制标题
由于与非凝结水的平衡而导致凝结水集体模式的阻尼
DOI：
10.1103/physreva.63.023612
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发表时间：
2000
影响因子：
2.9
通讯作者：
A. Griffin
中科院分区：
文献类型：
--
作者：
J. Williams;A. Griffin
我们考虑了在有限温度下由于凝结水和非凝结水原子之间缺乏平衡而引起的凝结水集体模式的阻尼，这一效应在通常的无碰撞区域讨论中被忽略了。作为第一个近似，我们忽略热云的动力学。我们的计算应该适用于与热云非相振荡的凝结物的集体模式。我们得到了有限温度下凝结物的广义Stringari运动方程，其中包含一个与凝结物不与静态热云处于扩散平衡有关的阻尼项。凝析模式的这种组分间碰撞阻尼在量级上与最近文献中考虑的朗道阻尼相当。
We consider the damping of condensate collective modes at finite temperatures arising from lack of equilibrium between the condensate and the non-condensate atoms, an effect that is ignored in the usual discussion of the collisionless region. As a first approximation, we ignore the dynamics of the thermal cloud. Our calculations should be applicable to collective modes of the condensate which are oscillating out-of-phase with the thermal cloud. We obtain a generalized Stringari equation of motion for the condensate at finite temperatures, which includes a damping term associated with the fact that the condensate is not in diffusive equilibrium with the static thermal cloud. This inter-component collisional damping of the condensate modes is comparable in magnitude to the Landau damping considered in the recent literature.