论文标题
环效的非休假$ xy $型号
Ring-Frustrated Non-Hermitian $XY$ Model
论文作者
论文摘要
我们研究了具有奇数晶格位点的XY封闭链的非热版本。我们认为抗铁磁耦合以及对称的非共线自旋耦合。发现在参数空间的某些区域中，能量谱是真实的。与以前的非热模型相反，基态是在这个真实能量谱区域内占有一种模式的状态，而不是人为地识别的真空状态。同时，出现了无间隙的激发，这是由旋转配置（例如旋转配置）制成的。还发现，这个扭结阶段具有非平凡的拓扑不变性。
We study a non-Hermitian version of XY closed chain with odd number of lattice sites. We consider both anti-ferromagnetic coupling and also a symmetric non-collinear spin coupling. It is found that the energy spectrum is real in certain region of the parameter space. In contrast to previous non-Hermitian models, the ground state is a state with one mode occupied inside this real energy spectrum region, instead of the artificially identified vacuum state. At the same time, there appears a gapless excitation, which is made by kink like spin configurations. It is also found that this kink phase has non-trivial topological invariant.
