Sound propagation in a Bose-Einstein condensate at finite temperatures

被引：44
|
作者：
Meppelink, R. [1 ]
Koller, S. B. [1 ]
van der Straten, P. [1 ]
机构：
[1] Univ Utrecht, NL-3508 TA Utrecht, Netherlands
来源：
PHYSICAL REVIEW A | 2009年 / 80卷 / 04期
关键词：
acoustic wave propagation; Bose-Einstein condensation; quantum fluids; DYNAMICS; GASES;
D O I：
10.1103/PhysRevA.80.043605
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
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.
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页数：6
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