Critcal velocity of superfluid flow past large obstacles in Bose-Einstein condensates
Critcal velocity of superfluid flow past large obstacles in Bose-Einstein condensates
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DOI：
10.1103/physreva.62.061601
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发表时间：
2000-06
影响因子：
2.9
通讯作者：
J. S. Stiessberger;W. Zwerger
中科院分区：
文献类型：
--
作者：
J. S. Stiessberger;W. Zwerger
通过考虑大小为R的大障碍物周围的超流体势流的稳定性，我们得到了临界速度阶为${v}_{c}\ensuremath{\sim}\ensuremath{\Elzxh}/mR的解析结果，与朗道判据的结果相反，它与障碍物大小成反比。我们的结果与Gross-Pitaevskii方程的数值解和最近对稀原子气体的玻色-爱因斯坦凝聚体临界速度的测量结果进行了比较。
By considering the stability of potential flow of a superfluid around large obstacles of size R, we derive an analytical result for the critical velocity that is of order ${v}_{c}\ensuremath{\sim}\ensuremath{\Elzxh}/mR,$ scaling inversely with obstacle size, in contrast to what is obtained from a Landau criterion. Our results are compared with numerical solutions of the Gross-Pitaevskii equation and with recent measurements of the critical velocity in Bose-Einstein condensates of dilute atomic gases.