Rotating spin-1/2 Bose-Einstein condensates in a gradient magnetic field with spin-orbit coupling
Rotating spin-1/2 Bose-Einstein condensates in a gradient magnetic field with spin-orbit coupling
复制标题
在自旋轨道耦合的梯度磁场中旋转自旋 1/2 玻色-爱因斯坦凝聚态
DOI：
10.1088/1572-9494/ab95fb
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发表时间：
2020
影响因子：
3.1
通讯作者：
Li Yue-Qing
中科院分区：
文献类型：
--
作者：
Wang Ji-Guo;Li Yue-Qing
研究了梯度磁场中二维自旋轨道耦合自旋1/2玻色-爱因斯坦凝聚（BEC）的基态位相。梯度磁场、自旋轨道耦合和转动之间的竞争导致了各种基态相结构。在弱旋转区，随着梯度磁场强度的增加，BEC经历了从不稳定相到单涡线相的相变。不稳定相呈现出沿着非对角方向的涡线结构。随着磁场梯度强度的增加，涡旋线的数量也随之变化。随着磁场梯度强度的进一步增大，形成沿对角线方向沿着具有单个涡线的单涡线相。相图表明，两相之间的边界与相对排斥力λ>= 1呈线性关系，而与λ < 1呈非线性关系。在较强的旋转区域，除了不稳定相和单涡线相外，强磁场梯度和快速旋转形成涡环相。涡环相表现为环中心的巨涡结构和隐涡结构。强磁场梯度使环周围的涡旋数保持不变。
We study the ground-state phases of two-dimensional rotating spin-orbit coupled spin-1/2 Bose-Einstein condensates (BECs) in a gradient magnetic field. The competition between gradient magnetic field, spin-orbit coupling and rotation leads to a variety of ground-state phase structures. In the weakly rotation regime, as the increase of gradient magnetic field strength, the BECs experiences a phase transition from the unstable phase to the single vortex-line phase. The unstable phase presents the vortex lines structures along the off-diagonal direction. With magnetic field gradient strength increasing, the number of vortex lines changes accordingly. As the magnetic field gradient strength increases further, the single vortex-line phase with a single vortex line along the diagonal direction is formed. The phase diagram shows that the boundary between the two phases is linear with the relative repulsion lambda >= 1 and is nonlinear with lambda < 1. In the relatively strong rotation regime, in addition to the unstable phase and the single vortex-line phase, the vortex-ring phase is formed for the strong magnetic field gradient and rapid rotation. The vortex-ring phase shows the giant and hidden vortex structures at the center of ring. The strong magnetic field gradient makes the number of the vortices around the ring unchanged.