论文标题
冷原子中的自旋nematic涡流状态
Spin-Nematic Vortex States in Cold Atoms
论文作者
论文摘要
（伪）自由度的自由度极大地丰富了冷原子的物理学。对于具有高旋转的系统（即，旋转量子数大于1/2）尤其如此。例如，不仅可以构建等级-1自旋矢量，还可以在高旋转系统中构造等级-2自旋张量。在这里，我们提出了一个简单的方案，以对自旋1冷原子系统中的自旋张量和质量中心轨道角动量进行，并表明这导致了这一问题的新量子相：自旋 - 纽马涡流状态，具有SU（2）Spin-Nematic Spinnematic Tensor张量子空间中的旋转旋转状态。在适当的条件下，此类状态以量化拓扑数为特征。我们的工作开辟了高旋转拓扑量子问题研究的新途径。
The (pseudo-)spin degrees of freedom greatly enriches the physics of cold atoms. This is particularly so for systems with high spins (i.e., spin quantum number larger than 1/2). For example, one can construct not only the rank-1 spin vector, but also the rank-2 spin tensor in high spin systems. Here we propose a simple scheme to couple the spin tensor and the center-of-mass orbital angular momentum in a spin-1 cold atom system, and show that this leads to a new quantum phase of the matter: the spin-nematic vortex state that features vorticity in an SU(2) spin-nematic tensor subspace. Under proper conditions, such states are characterized by quantized topological numbers. Our work opens up new avenues of research in topological quantum matter with high spins.
