Experimental observation of non-Hermitian higher-order skin interface states in topological electric circuits
Bin Liu, Yang Li, Bin Yang, Xiaopeng Shen, Yuting Yang, Zhi Hong Hang, Motohiko Ezawa
Abstract
The study of topological states has developed rapidly in electric circuits, which permits flexible fabrications of non-Hermitian systems by introducing non-Hermitian terms. Here, nonreciprocal coupling terms are realized by utilizing a voltage follower module in non-Hermitian topological electric circuits. We report the experimental realization of one- and two-dimensional non-Hermitian skin interface states in electric circuits, where interface states induced by non-Hermitian skin effects are localized at the interface of different domains carrying different winding numbers. Our electric circuit system provides a readily accessible platform to explore non-Hermitian-induced topological phases, and paves a new road for device applications.