Loss-induced Floquet non-Hermitian skin effect

Yaohua Li, Cuicui Lu, Shuang Zhang, Yong Chun Liu

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Abstract

Non-Hermitian topological systems have attracted much interest due to their unique topological properties when the non-Hermitian skin effect (NHSE) appears. However, the experimental realization of NHSE conventionally requires nonreciprocal couplings, which are compatible with limited systems. Here, we propose a mechanism of loss-induced Floquet NHSE, where the loss provides the basic source of non-Hermicity and the Floquet engineering brings about Floquet-induced complex next-nearest-neighbor couplings. We also extend the generalized Brillouin zone theory to nonequilibrium systems to describe the Floquet NHSE. Furthermore, we show that this mechanism can realize the second-order NHSE when generalized to two-dimensional systems. Our proposal can be realized in photonic lattices with helical waveguides and other related systems, which opens the door for the study of topological phases in Floquet non-Hermitian systems.

Original languageEnglish
Article numberL220301
JournalPhysical Review B
Volume108
Issue number22
DOIs
Publication statusPublished - 1 Dec 2023

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Li, Y., Lu, C., Zhang, S., & Liu, Y. C. (2023). Loss-induced Floquet non-Hermitian skin effect. Physical Review B, 108(22), Article L220301. https://doi.org/10.1103/PhysRevB.108.L220301