Authors
He Gao, Haoran Xue, Zhongming Gu, Linhu Li, Weiwei Zhu, Zhongqing Su, Jie Zhu, Baile Zhang, YD Chong
Publication date
2022/10/1
Journal
Physical Review B
Volume
106
Issue
13
Pages
134112
Publisher
American Physical Society
Description
We present a one-dimensional coupled ring resonator lattice exhibiting a variant of the non-Hermitian skin effect (NHSE) that we call the anomalous Floquet NHSE. Unlike existing approaches to achieving the NHSE by engineering gain and loss on different ring segments, our design uses fixed on-site gain or loss in each ring. The anomalous Floquet NHSE is marked by the existence of skin modes at every value of the Floquet quasienergy, allowing for broadband asymmetric transmission. Varying the gain or loss induces a non-Hermitian topological phase transition, reversing the localization direction of the skin modes. An experimental implementation in an acoustic lattice yields good agreement with theoretical predictions, with a very broad relative bandwidth of around 40%.
Total citations
20222023202421817
Scholar articles
H Gao, H Xue, Z Gu, L Li, W Zhu, Z Su, J Zhu, B Zhang… - Physical Review B, 2022
H Gao, H Xue, Z Gu, L Li, W Zhu, Z Su, J Zhu, B Zhang… - arXiv e-prints, 2022