Landau Damping of Collective Mode in a Quasi-One-Dimensional Repulsive Bose—Einstein Condensate
Landau Damping of Collective Mode in a Quasi-One-Dimensional Repulsive Bose—Einstein Condensate
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DOI：
10.1088/0253-6102/57/5/08
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发表时间：
2012-05
影响因子：
3.1
通讯作者：
ZhanXin Yang;Zhaoyuan Chai;Chen-Xu Li;Xiao-Dong Ma
中科院分区：
文献类型：
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作者：
ZhanXin Yang;Zhaoyuan Chai;Chen-Xu Li;Xiao-Dong Ma
利用自洽含时Hartree-Fock-Bogoliubov近似研究了准一维排斥玻色-爱因斯坦凝聚体中集体模的朗道阻尼.提出了一种计算凝聚体中集体模朗道阻尼率的新方法，并讨论了朗道阻尼率与温度、横向俘获频率、凝聚体中原子数和系统长度的关系.与通常的三维系统计算方法不同，我们的新计算方法是一种考虑基元激发实际弛豫的交互式计算方法。在很小的近似下，理论计算结果与实验结果一致。与通常的计算方法相比，本文的理论有助于推知阻尼现象中粒子间的相互作用。
We investigate the Landau damping of the collective mode in a quasi-one-dimensional repulsive Bose—Einstein condensate by using the self-consistent time-dependent Hartree—Fock—Bogoliubov approximation. We put forward a new method to calculate the Landau damping rate of the collective mode in the condensate and discuss the dependence of the Landau damping on temperature, on transverse trapping frequency, on atom number in the condensate, and on length of the system. Different from the usual calculation method for the three dimension system, our new calculation method is an interactive one by considering the practical relaxation of the elementary excitation. With little approximation, our theoretical calculation results agree with the experimental ones. Comparing with the usual calculation method, our theory is helpful to deduce the inter-particle interactions in damping phenomenon.