Spin-orbit coupling stabilizing half-quantum spin defect in spin-1 Bose-Einstein condensates
Spin-orbit coupling stabilizing half-quantum spin defect in spin-1 Bose-Einstein condensates
复制标题
自旋轨道耦合稳定自旋 1 玻色-爱因斯坦凝聚中的半量子自旋缺陷
DOI：
10.1364/oe.25.032800
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发表时间：
2017-12
期刊：
影响因子：
3.8
通讯作者：
Wu-Ming Liu
中科院分区：
文献类型：
--
作者：
Chao-Fei Liu;Wu-Ming Liu
量子拓扑缺陷通常在密度上被激发。在这项研究中，我们将拓扑缺陷扩展到另一个维度：自旋。我们指出，自旋奇异性（其中自旋密度|S|在局部消失）在这两个（此处句子似乎不完整）中普遍存在。
Quantum topological defects usually are excited on density. In this study, we extend the topological defect to another dimensionality: the spin. We indicate that the spin singularity, where the spin density |S| vanishes locally, occurs commonly in the two-dimensional spin-1 Bose-Einstein condensates. We assume a coreless half-quantum vortex solution in the spin-1 Bose-Einstein condensates according to the spin singularity. This half-quantum vortex can further induce a half-quantum spin defect, which is similar to the general half-quantum Skyrmion but its centre proposes singularity on the spin density. We use the variational method to obtain a possible stable solution under the combined interaction of the spin-orbit coupling and the external magnetic field. Our calculation shows that the isotropic spin-orbit coupling provides local energy minimum to stabilize the coreless half-quantum vortex and the corresponding singular half-quantum spin texture excitation. The combined restriction of the isotropic spin-orbit coupling and the perpendicular magnetic field is a key factor to obtain this kind of excitation. Our study also provides the stability phase diagram and the most possible size of the half-quantum vortex. Furthermore, our analysis shows that adjusting of the spin interaction hardly affects the stability of the half-quantum vortex.