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arXiv 1609.02506cond-mat.quant-gas
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自旋为1的玻色-爱因斯坦凝聚体中孤立粒子的演化

Evolution of an isolated monopole in a spin-1 Bose-Einstein condensate

Konstantin Tiurev, Pekko Kuopanportti, András Márton Gunyhó, Masahito Ueda, Mikko Möttönen

摘要:

我们模拟了自旋为1的玻色-爱因斯坦凝聚体在从极性到铁磁的相变过程中,孤立的π缺陷在π矢量中的衰变动力学。重要的是,在不存在外部磁场的情况下发生的衰减的磁共振,主要是由动力学不稳定性,由于铁磁自旋交换相互作用。观察到初始孤立的自旋弛豫成极核自旋涡旋,从而证明了从极序参量流形的点缺陷到铁磁流形的线缺陷的自发转变。我们还研究了被缠绕数为k的量子涡旋线穿透的孤立微扰系统的动力学。当k = 1时,它衰减为无核Anderson-Toulouse涡;当k = 2时,它衰减为空核奇异涡。在这两种情况下,产生的涡流也被极核涡环包围。

英文摘要:

We simulate the decay dynamics of an isolated monopole defect in the nematic vector of a spin-1 Bose-Einstein condensate during the polar-to-ferromagnetic phase transition of the system. Importantly, the decay of the monopole occurs in the absence of external magnetic fields and is driven principally by the dynamical instability due to the ferromagnetic spin-exchange interactions. An initial isolated monopole is observed to relax into a polar-core spin vortex, thus demonstrating the spontaneous transformation of a point defect of the polar order parameter manifold to a line defect of the ferromagnetic manifold. We also investigate the dynamics of an isolated monopole pierced by a quantum vortex line with winding number k. It is shown to decay into a coreless Anderson-Toulouse vortex if k = 1 and into a singular vortex with an empty core if k = 2. In both cases, the resulting vortex is also encircled by a polar-core vortex ring.

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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