Experimental observation of non-Hermitian higher-order skin interface states in topological electric circuits

TL;DR

This paper reports the experimental observation of non-Hermitian higher-order skin interface states in topological electric circuits, demonstrating localized interface states caused by non-Hermitian skin effects, and highlighting a platform for exploring non-Hermitian topological phases.

Contribution

It experimentally realizes non-Hermitian skin interface states in electric circuits using nonreciprocal coupling, advancing the study of non-Hermitian topological phenomena.

Findings

Observation of non-Hermitian skin interface states

Localization of states at domain interfaces with different winding numbers

Electric circuits as accessible platforms for topological phase exploration

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.