Loss-induced Floquet non-Hermitian skin effect
- URL: http://arxiv.org/abs/2306.04460v1
- Date: Wed, 7 Jun 2023 14:36:34 GMT
- Title: Loss-induced Floquet non-Hermitian skin effect
- Authors: Yaohua Li, Cuicui Lu, Shuang Zhang, Yong-Chun Liu
- Abstract summary: We propose a mechanism of loss-induced Floquet NHSE, where the loss provides the basic source of non-Hermicity.
We extend the generalized Brillouin zone theory to nonequilibrium systems to describe the Floquet NHSE.
Our proposal can be realized in photonic lattices with helical waveguides and other related systems.
- Score: 0.5085064777896466
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Non-Hermitian topological systems have attracted lots of interest due to
their unique topological properties when the non-Hermitian skin effect (NHSE)
appears. However, the experimental realization of NHSE conventionally requires
non-reciprocal 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 the
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.
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