Photonic Floquet skin-topological effect
Abstract
Non-Hermitian skin effect and photonic topological edge states are of great interest in non-Hermitian physics and optics. However, the interplay between them is largly unexplored. Here, we propose and demonstrate experimentally the non-Hermitian skin effect that constructed from the nonreciprocal flow of Floquet topological edge states, which can be dubbed 'Floquet skin-topological effect'. We first show the non-Hermitian skin effect can be induced by pure loss when the one-dimensional (1D) system is periodically driven. Next, based on a two-dimensional (2D) Floquet topological photonic lattice with structured loss, we investigate the interaction between the non-Hermiticity and the topological edge states. We observe that all the one-way edge states are imposed onto specific corners, featuring both the non-Hermitian skin effect and topological edge states. Furthermore, a topological switch for the skin-topological effect is presented by utilizing the gap-closing mechanism. Our experiment paves the way of realizing non-Hermitian topological effects in nonlinear and quantum regimes.
Keywords
Cite
@article{arxiv.2306.03705,
title = {Photonic Floquet skin-topological effect},
author = {Yeyang Sun and Xiangrui Hou and Tuo Wan and Fangyu Wang and Shiyao Zhu and Zhichao Ruan and Zhaoju Yang},
journal= {arXiv preprint arXiv:2306.03705},
year = {2023}
}