Vortex molecules in coherently coupled two-component Bose-Einstein condensates.
Vortex molecules in coherently coupled two-component Bose-Einstein condensates.
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DOI：
10.1103/physrevlett.93.250406
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发表时间：
2004-06
影响因子：
8.6
通讯作者：
K. Kasamatsu;M. Tsubota;Masahito Ueda
中科院分区：
文献类型：
--
作者：
K. Kasamatsu;M. Tsubota;Masahito Ueda
在内部超精细态被外场相干耦合的旋转双组分玻色-爱因斯坦凝聚体中，预测了涡旋分子。一个分量中的涡旋和另一个分量中的涡旋通过相对相的畴壁连接起来，构成一个“涡旋分子”，其特征是具有一对介子的非轴对称（伪）自旋纹理。基于广义非线性sigma模型和变分分析，讨论了涡旋分子的结合机理。涡旋分子的各向异性是由散射长度的差异引起的，在快速旋转凝聚体中产生扭曲的涡旋分子晶格。
A vortex molecule is predicted in rotating two-component Bose-Einstein condensates whose internal hyperfine states are coupled coherently by an external field. A vortex in one component and one in the other are connected by a domain wall of the relative phase, constituting a "vortex molecule," which features a nonaxisymmetric (pseudo)spin texture with a pair of merons. The binding mechanism of the vortex molecule is discussed based on a generalized nonlinear sigma model and a variational ansatz. The anisotropy of vortex molecules is caused by the difference in the scattering lengths, yielding a distorted vortex-molecule lattice in fast rotating condensates.