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arXiv 1804.04037cond-mat.quant-gas
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均匀超流二维玻色气体中的声传播

Sound propagation in a uniform superfluid two-dimensional Bose gas

J. L. Ville, R. Saint-Jalm, É. Le Cerf, M. Aidelsburger, S. Nascimbène, J. Dalibard, J. Beugnon

摘要:

在超流体系统中,可以激发几种声音模式,例如液氦中的第一和第二声音。在这里,我们激发传播和驻波在一个统一的二维玻色气体,我们的特点是在超流和正常制度的声音传播。在超流相,测量的声速很好地描述了一个双流体流体动力学模型,和弱阻尼率很好地解释了与热激发的散射。在正常阶段,由于偏离流体动力学行为,声音变得强烈阻尼。

英文摘要:

In superfluid systems several sound modes can be excited, as for example first and second sound in liquid helium. Here, we excite propagating and standing waves in a uniform two-dimensional Bose gas and we characterize the propagation of sound in both the superfluid and normal regime. In the superfluid phase, the measured speed of sound is well described by a two-fluid hydrodynamic model, and the weak damping rate is well explained by the scattering with thermal excitations. In the normal phase the sound becomes strongly damped due to a departure from hydrodynamic behavior.

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。

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