Borgh Magnus O, Ruostekoski Janne
Mathematical Sciences, University of Southampton, SO17 1BJ Southampton, United Kingdom.
Phys Rev Lett. 2016 Dec 30;117(27):275302. doi: 10.1103/PhysRevLett.117.275302. Epub 2016 Dec 29.
We calculate the energetic structure of defect cores and propose controlled methods to imprint a nontrivially entangled vortex pair that undergoes non-Abelian vortex reconnection in a biaxial nematic spin-2 condensate. For a singular vortex, we find three superfluid cores in addition to depletion of the condensate density. These exhibit order parameter symmetries that are different from the discrete symmetry of the biaxial nematic phase, forming an interface between the defect and the bulk superfluid. We provide a detailed analysis of phase mixing in the resulting vortex cores and find an instability dependent upon the orientation of the order parameter. We further show that the spin-2 condensate is a promising system for observing spontaneous deformation of a point defect into an "Alice ring" that has so far avoided experimental detection.
我们计算了缺陷核心的能量结构，并提出了可控方法，以在双轴向列自旋 - 2凝聚体中印记出一个经历非阿贝尔涡旋重连的非平凡纠缠涡旋对。对于奇异涡旋，除了凝聚体密度的耗尽外，我们还发现了三个超流核心。这些核心表现出与双轴向列相的离散对称性不同的序参量对称性，在缺陷与体超流之间形成了一个界面。我们对所得涡旋核心中的相混合进行了详细分析，发现了一种依赖于序参量取向的不稳定性。我们进一步表明，自旋 - 2凝聚体是一个有前途的系统，可用于观测点缺陷自发变形为“爱丽丝环”，而这种现象迄今为止一直未被实验检测到。
