Anomalous floquet non-Hermitian skin effect in a ring resonator lattice

Anomalous floquet non-Hermitian skin effect in a ring resonator lattice

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-sit...

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Bibliographic Details
Main Authors: Gao, He, Xue, Haoran, Gu, Zhongming, Li, Linhu, Zhu, Weiwei, Su, Zhongqing, Zhu, Jie, Zhang, Baile, Chong, Y. D.
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2023
Subjects:
Science::Physics
Mesoscopic Systems
Quantum Hall Effect
Online Access:https://hdl.handle.net/10356/164826
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Institution: Nanyang Technological University
Language: English
Description
Summary: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/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%.

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