Axisymmetric versus nonaxisymmetric vortices in spinor Bose-Einstein condensates
Axisymmetric versus nonaxisymmetric vortices in spinor Bose-Einstein condensates
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DOI：
10.1103/physreva.66.053610
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发表时间：
2002-08
影响因子：
2.9
通讯作者：
T. Mizushima;K. Machida;T. Kita
中科院分区：
文献类型：
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作者：
T. Mizushima;K. Machida;T. Kita
通过求解旋转下的扩展Gross-Pitaevskii方程，研究了F=1旋量玻色-爱因斯坦凝聚体中各种旋涡的结构和稳定性。我们对稳定的涡旋进行了广泛的搜索，同时考虑了轴对称和非轴对称涡旋，并涵盖了广泛的铁磁和反铁磁相互作用。在铁磁情况下，称为Mermin-Ho(Anderson-Toulouse)涡的拓扑缺陷是稳定的。通过比较可能涡旋的自由能，在外旋Ω与总磁化强度M的平面内建立了相图。结果表明，轴对称旋涡与非轴对称旋涡之间存在着质的差异，主要表现在W相关和M相关。
The structure and stability of various vortices in F= 1 spinor Bose-Einstein condensates are investigated by solving the extended Gross-Pitaevskii equation under rotation. We perform an extensive search for stable vortices, considering both axisymmetric and nonaxisymmetric vortices and covering a wide range of ferromagnetic and antiferromagnetic interactions. The topological defect called the Mermin-Ho (Anderson-Toulouse) vortex is shown to be stable for the ferromagnetic case. The phase diagram is established in a plane of external rotation Ω versus total magnetization M by comparing the free energies of possible vortices. It is shown that there are qualitative differences between axisymmetric and nonaxisymmetric vortices which are manifested in the W and M dependences.