论文标题
通过杂质模式诊断非重点拓扑晶格的散装相图
Diagnosis of bulk phase diagram of non-reciprocal topological lattices by impurity modes
论文作者
论文摘要
我们研究了由非重生Su-Schrieffer-Heeger模型所描述的非热晶格中的单个杂质问题，并获得了由杂质引起的局部结合状态的相图。分析结果的存在使我们能够准确地确定相边界，这些相位区域将其与不同数量的绑定状态分开。特别是，在强大杂质潜力的极限上，我们发现中间隙结合状态的相边界与在没有杂质的情况下与散装系统拓扑相图的边界相同。中间隙杂质模式和大量相之间的对应关系的存在表明，我们能够通过其杂质模式来诊断非重点拓扑模型的批量相图。
We study the single impurity problem in the non-Hermitian lattice described by the non-reciprocal Su-Schrieffer-Heeger model and obtain the phase diagram of localized bound states induced by the impurity. The existence of analytical results permits us to determine the phase boundaries exactly, which separate regions with different number of bound states. Particularly, in the limit of strong impurity potential, we find that the phase boundaries of mid-gap bound states are identical to the boundaries of topological phase diagrams of the bulk system in the absence of impurity. The existence of correspondence between mid-gap impurity modes and bulk phases indicate that we are able to diagnose the bulk phase diagram of the non-reciprocal topological model by its impurity modes.
