Dynamical Simulation of Sound Propagation in a Highly Elongated Trapped Bose Gas at Finite Temperatures
Dynamical Simulation of Sound Propagation in a Highly Elongated Trapped Bose Gas at Finite Temperatures
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DOI：
10.1007/s10909-012-0829-7
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发表时间：
2013
影响因子：
2
通讯作者：
E. Arahata;T. Nikuni
中科院分区：
文献类型：
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作者：
E. Arahata;T. Nikuni
我们研究了在有限温度下，在高度拉长的简谐囚禁中的玻色凝聚气体中的声传播。我们的分析基于Zaremba-Nikuni-Griffin(ZNG)形式，它由凝聚态的Gross-Pitaevskii方程和热云的动力学方程组成。我们将ZNG形式推广到处理高度各向异性的陷波势场，并用它来模拟双流体流体动力学区域中的声传播。我们使用陷阱参数进行实验，该实验报告了第二次声音传播。我们的模拟结果表明，在中等温度下可以观察到对应于第一声和第二声的两个声脉冲的传播。
We study sound propagation in a Bose-condensed gas confined in a highly elongated harmonic trap at finite temperatures. Our analysis is based on Zaremba-Nikuni-Griffin (ZNG) formalism, which consists of Gross-Pitaevskii equation for the condensate and the kinetic equation for a thermal cloud. We extend ZNG formalism to deal with a highly-anisotropic trap potential, and use it to simulate sound propagation in the two fluid hydrodynamic regime. We use the trap parameters for the experiment that has reported second sound propagation. Our simulation results show that propagation of two sound pulses corresponding to first and second sound can be observed in an intermediate temperature.