Title : Topological edge states and skin effects in one-dimensional non-hermitian extended SSH models

Non-Hermitian topological systems have drawn great interest in condensed matter physics and optics. The non-Hermitian skin effect has overturned the conventional bulkboundary correspondence. While abundant phenomena and topological theories have been developed, interactions between topological edge states and the skin effect remain underexplored. Based on a one-dimensional extended non-Hermitian SSH4 model, we systematically investigate the interplay between topological edge states and the skin effect. The skin effect strongly modulates the localization of edge states and may reverse their localization direction. In certain parameter ranges, edge states can also decouple from the skin effect and persist inside the band gap. These findings advance the topological theory of the SSH model and support experimental implementations in circuits and acoustics. We also provide new routes to designing robust devices for energy storage and conversion, such as directional energy harvesters, non-reciprocal amplifiers and anti-noise sensors.

Yating Wei is a researcher at Southeast University. Her research interests include non-Hermitian topological physics, topological edge states, non-Hermitian skin effects, and their applications in robust energy conversion systems. She has published one paper in Physical Review B (PRB).