物理
厄米矩阵
齐次空间
拓扑(电路)
相变
拓扑缺陷
GSM演进的增强数据速率
皮肤效应
相(物质)
拓扑序
凝聚态物理
量子力学
几何学
数学
计算机科学
组合数学
电信
量子
作者
Yaohua Li,Chao Liang,Chenyang Wang,Cuicui Lu,Yong-Chun Liu
标识
DOI:10.1103/physrevlett.128.223903
摘要
Non-Hermitian topological effects are of crucial importance both in fundamental physics and applications. Here we discover the gain-loss-induced hybrid second-order skin-topological effect and the PT phase transition in skin-topological modes. By studying a non-Hermitian Haldane model, we find that the topological edge modes are localized on a special type of corner, while the bulk modes remain extended. Such an effect originates from the interplay between gain, loss, and the chiral edge currents induced by the nonlocal flux, which can be characterized by considering the properties of the edge sites as a one-dimensional chain. We establish a relation between the skin-topological effect and the PT symmetries belonging to different edges. Moreover, we discover the PT phase transition with the emergence of exceptional points between pairs of skin-topological modes. Our results pave the way for the investigation of non-Hermitian topological physics and PT phase transition in higher-dimensional systems.
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