论文标题
二阶拓扑非铁皮皮肤效应
Second-order topological non-Hermitian skin effects
论文作者
论文摘要
高阶拓扑结束了拓扑结实的角模式，作为非平凡性的表现。从理论上讲，我们提出了非铁皮皮肤效应，源于手性 - 对称遗产系统的二阶拓扑。发现皮肤模式位于角落。我们通过二维固有和外在的二阶拓扑演示了两种类型的二阶拓扑皮肤效应。固有的二阶拓扑效应在拓扑上以散装反演对称性和手性对称性为特征。同时，外在的二阶拓扑效应来自边缘和角落之间的拓扑对应关系。我们表明，通过使用二阶和常规一阶拓扑之间的关系来出现非炎性皮肤模式。
Higher-order topology realizes topologically robust corner modes as a manifestation of nontriviality. We theoretically propose non-Hermitian skin effects which stem from second-order topology of chiral-symmetric Hermitian systems. It is found that the skin modes are localized at the corners. We demonstrate two types of second-order topological skin effects by two-dimensional intrinsic and extrinsic second-order topology. The intrinsic second-order topological skin effect is characterized topologically by bulk inversion symmetry as well as chiral symmetry. Meanwhile, the extrinsic second-order topological skin effect occurs from the topological correspondence between the edges and corners. We show that the non-Hermitian skin modes emerge by using a relationship between second-order and conventional first-order topology.
