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arXiv 1408.5218cond-mat.quant-gas
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玻色-爱因斯坦凝聚体中隐涡的钉扎

Pinning of Hidden Vortices in Bose-Einstein Condensate

T. Mithun, K. Porsezian, Bishwajyoti Dey

摘要:

研究了旋转双阱势和同向旋转光晶格中玻色-爱因斯坦凝聚体的涡旋动力学和涡旋钉扎效应。我们发现,与实验一致,当旋转频率为$Ω\rightarrow 1$时,如果陷阱势为各向异性双阱型,则涡旋数不发散。由数值模拟得到的临界转动频率与$l=4$的值$\sqrt l/l$吻合得很好,这支持了双势阱中旋转凝聚体能激发出具有角动量的表面模$l=4$的猜想.旋转三势阱中的涡旋晶格结构及其钉扎现象显示出非常有趣的特征。我们发现了一种新的隐涡的存在和钉扎,它的相位轮廓与可见涡的相位轮廓相似。

英文摘要:

We study the vortex dynamics and vortex pinning effect in Bose-Einstein condensate in a rotating double-well trap potential and co-rotating optical lattice. We show that, in agreement with the experiment, the vortex number do not diverge when the rotational frequency $Ω\rightarrow 1$ if the trap potential is of anisotropic double-well type. The critical rotational frequency as obtained from numerical simulations agrees very well with the value $\sqrt l/l$ for $l=4$ which supports the conjecture that surface modes with angular momentum $l=4$ are excited when the rotating condensate is trapped in double-well potential. The vortex lattice structure in a rotating triple-well trap potential and its pinning shows very interesting features. We show the existence and pinning of a new type of hidden vortices whose phase profile is similar to that of the visible vortices.

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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