Landau damping of collective mode in a quasi-two-dimensional repulsive Bose—Einstein condensate
Landau damping of collective mode in a quasi-two-dimensional repulsive Bose—Einstein condensate
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DOI：
10.1088/1674-1056/20/7/070307
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发表时间：
2011-07
影响因子：
1.7
通讯作者：
Ma Xiao-dong;Yang Zhan-jin;Lu Junzhe;Wei Wei-Wei
中科院分区：
文献类型：
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作者：
Ma Xiao-dong;Yang Zhan-jin;Lu Junzhe;Wei Wei-Wei
我们通过使用自洽的时间相关 Hatree-Fock-Bogoliubov 近似和系统基本激励的完整正交本征函数集，研究了准二维排斥性玻色-爱因斯坦凝聚体中集体模式的朗道阻尼。我们计算了集体模式与热激发准粒子之间的三模式耦合矩阵元以及集体模式的朗道阻尼率。我们讨论了朗道阻尼对温度、凝聚态原子数、横向俘获频率和凝聚态长度的依赖性。我们的计算中考虑了集体模式的能量宽度。理论计算结果与实验结果吻合得很好，有助于推导阻尼力学和颗粒间相互作用。
We investigate the Landau damping of the collective mode in a quasi-two-dimension repulsive Bose–Einstein condensate by using the self-consistent time-dependent Hatree–Fock–Bogoliubov approximation and a complete and orthogonal eigenfunction set for the elementary excitation of the system. We calculate the three-mode coupling matrix element between the collective mode and the thermal excited quasi-particles and the Landau damping rate of the collective mode. We discuss the dependence of the Landau damping on temperature, on atom number in the condensate, on transverse trapping frequency and on the length of the condensate. The energy width of the collective mode is taken into account in our calculation. With little approximation, our theoretic calculation results agree well with the experimental ones and are helpful for deducing the damping mechanics and the inter-particle interaction.