Vortex nucleation by collapsing bubbles in Bose-Einstein condensates.
Vortex nucleation by collapsing bubbles in Bose-Einstein condensates.
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通过玻色-爱因斯坦凝聚中的气泡破裂而产生涡旋成核。
DOI：
10.1103/physrevlett.93.090401
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发表时间：
2004
影响因子：
8.6
通讯作者：
C. Barenghi
中科院分区：
文献类型：
--
作者：
N. Berloff;C. Barenghi
超流体中超声气泡的溃灭伴随着涡环的形核。使用Gross-Pitaevskii方程的均匀凝聚，我们阐明了一个固定的球对称气泡的崩溃的各个阶段，并建立必要的条件，涡核。静止气泡的最小半径为28+/-1愈合长度，其破裂导致涡旋成核。成核成为可能之后的时间被确定为气泡半径的函数。我们表明，漩涡成核发生在移动的气泡，甚至更小的半径，如果运动使他们足够扁。
Nucleation of vortex rings accompanies the collapse of ultrasound bubbles in superfluids. Using the Gross-Pitaevskii equation for a uniform condensate we elucidate the various stages of the collapse of a stationary spherically symmetric bubble and establish conditions necessary for vortex nucleation. The minimum radius of the stationary bubble, whose collapse leads to vortex nucleation, was found to be 28+/-1 healing lengths. The time after which the nucleation becomes possible is determined as a function of the bubble's radius. We show that vortex nucleation takes place in moving bubbles of even smaller radius if the motion makes them sufficiently oblate.