Observation of non-Hermitian boundary induced hybrid skin-topological effect excited by synthetic complex frequencies.

ABSTRACT: The hybrid skin-topological effect (HSTE) has recently been proposed as a mechanism where topological edge states collapse into corner states under the influence of the non-Hermitian skin effect (NHSE). However, directly observing this effect is challenging due to the complex frequencies of eigenmodes. In this study, we experimentally observe HSTE corner states using synthetic complex frequency excitations in a transmission line network. We demonstrate that HSTE induces asymmetric transmission along a specific direction within the topological band gap. Besides HSTE, we identify corner states originating from non-chiral edge states, which are caused by the unbalanced effective onsite energy shifts at the boundaries of the network. Furthermore, our results suggest that whether the bulk inter

SUBMITTER: Jiang T 

PROVIDER: S-EPMC11686033 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature