arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0909.3455cond-mat.quant-gas
收藏

有限温度下玻色-爱因斯坦凝聚体中的声传播

Sound propagation in a Bose-Einstein condensate at finite temperatures

R. Meppelink, S. B. Koller, P. van der Straten

摘要:

研究了有限温度下磁陷玻色-爱因斯坦凝聚体中密度波的传播。热云是在流体动力学制度和系统,因此描述的双流体模型。相衬成像技术被用来成像的原子云,使我们能够观察到小密度激发。密度波在冷凝物中的传播用于确定作为温度的函数的声速。我们发现的声速是在很好的协议与计算的基础上的朗道双流体模型。

英文摘要:

We study the propagation of a density wave in a magnetically trapped Bose-Einstein condensate at finite temperatures. The thermal cloud is in the hydrodynamic regime and the system is therefore described by the two-fluid model. A phase-contrast imaging technique is used to image the cloud of atoms and allows us to observe small density excitations. The propagation of the density wave in the condensate is used to determine the speed of sound as a function of the temperature. We find the speed of sound to be in good agreement with calculations based on the Landau two-fluid model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑