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arXiv 1401.4041cond-mat.quant-gas
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玻色-爱因斯坦凝聚体中经典尾迹的量子模拟

Quantum Analogs of Classical Wakes in Bose-Einstein Condensates

G. W. Stagg, N. G. Parker, C. F. Barenghi

摘要:

我们表明,一个椭圆形的障碍物通过玻色-爱因斯坦凝聚体移动产生的量子涡,这类似于那些经典的粘性流通过一个圆柱或球体的尾迹。椭圆度的作用是促进由障碍物成核的涡的相互作用。初始稳定对称尾流失去了它们的对称性,并形成类似符号的涡簇,类似于经典的Bénard-von Kármán涡街。我们的研究结果,在二维和三维的数值证明,证实了足够大数量的量子循环再现经典物理的直觉。

英文摘要:

We show that an elliptical obstacle moving through a Bose-Einstein condensate generates wakes of quantum vortices which resemble those of classical viscous flow past a cylinder or sphere. The role of ellipticity is to facilitate the interaction of the vortices nucleated by the obstacle. Initial steady symmetric wakes lose their symmetry and form clusters of like-signed vortices, in analogy to the classical Bénard-von Kármán vortex street. Our findings, demonstrated numerically in both two and three dimensions, confirm the intuition that a sufficiently large number of quanta of circulation reproduce classical physics.

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