Quadrupole collective modes in trapped finite-temperature Bose-Einstein condensates.
Quadrupole collective modes in trapped finite-temperature Bose-Einstein condensates.
复制标题
有限温度玻色-爱因斯坦凝聚体中的四极集体模式。
DOI：
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发表时间：
2002
影响因子：
8.6
通讯作者：
E. Zaremba
中科院分区：
文献类型：
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作者：
B. Jackson;E. Zaremba
本文用温度模拟方法研究了玻色-爱因斯坦凝聚态的四极激发。我们专注于m = 0模式，其中一个长期存在的理论问题是占模式频率随温度的异常变化。我们解释这种行为的两个单独的模式，对应于冷凝物和热云的耦合运动的激发。模式的相对振幅敏感地取决于温度和用于激励它们的谐波驱动器的频率。在适当的驱动频率下，与实验结果吻合较好。
Finite-temperature simulations are used to study quadrupole excitations of a trapped Bose-Einstein condensate. We focus specifically on the m = 0 mode, where a long-standing theoretical problem is to account for an anomalous variation of the mode frequency with temperature. We explain this behavior in terms of the excitation of two separate modes, corresponding to the coupled motion of the condensate and the thermal cloud. The relative amplitude of the modes depends sensitively on the temperature and on the frequency of the harmonic drive used to excite them. Good agreement with experiment is found for appropriate drive frequencies.