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arXiv 1607.00218cond-mat.quant-gas
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细长阱中超流体的流体动力学谱

Hydrodynamic spectrum of a superfluid in an elongated trap

Pierre-Philippe Crépin, Xavier Leyronas, Frédéric Chevy

摘要:

本文研究了圆柱形阱中超流体的流体动力学谱。我们发现声子支尺度的色散关系$ω$(q)在大q时类似于$\sqrt$ q,导致一个极小的超流临界速度。实际上,临界速度是由流体动力学近似的分解确定的.对于一大类超流体来说,这意味着临界速度相对于自由空间预测(这里$ω$ $\perp$是俘获频率,<$1/2c是云的化学势)降低了($ω$ $\perp$ /<$1/2c)1/3。

英文摘要:

--In this article we study the hydrodynamic spectrum of a superfluid confined in a cylindrical trap. We show that the dispersion relation $ω$(q) of the phonon branch scales like $\sqrt$ q at large q, leading to a vanishingly small superfluid critical velocity. In practice the critical velocity is set by the breakdown of the hydrodynamic approximation. For a broad class of superfluids, this entails a reduction of the critical velocity by a factor ($ω$ $\perp$ /ï1/2c) 1/3 with respect to the free-space prediction (here $ω$ $\perp$ is the trapping frequency and ï1/2c the chemical potential of the cloud).

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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