Dipole oscillations in Bose-Fermi mixtures in the time-dependent Gross-Pitaevskii and Vlasov equations
Dipole oscillations in Bose-Fermi mixtures in the time-dependent Gross-Pitaevskii and Vlasov equations
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DOI：
10.1103/physreva.77.063611
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发表时间：
2007-06
影响因子：
2.9
通讯作者：
T. Maruyama;G. Bertsch
中科院分区：
文献类型：
--
作者：
T. Maruyama;G. Bertsch
我们用一种动力学的时变方法研究了玻色-费米混合物中的偶极子集体振荡，该方法由时变的Gross-Pitaevskii方程和Vlasov方程表述。我们发现费米子振荡的行为与通常的随机相位近似和和规则方法有很大的不同。当玻色气体单调振荡时，费米子振荡表现出节拍和阻尼。当振幅不是最小时，费米气体的偶极振荡不能用简单的质心运动来描述。
We study the dipole collective oscillations in the bose-fermi mixture using a dynamical time-dependent approach, which are formulated with the time-dependent Gross-Pitaevskii equation and the Vlasov equation. We find big difference in behaviors of fermion oscillation between the time-dependent approach and usual approaches such as the random-phase approximation and the sum-rule approach. While the bose gas oscillates monotonously, the fermion oscillation shows a beat and a damping. When the amplitude is not minimal, the dipole oscillation of the fermi gas cannot be described with a simple center-of-mass motion.