Observation of dynamic non-Hermitian skin effects

Zhen Li, Li-Wei Wang, Xulong Wang, Zhi-Kang Lin, Guancong Ma () and Jian-Hua Jiang ()
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Zhen Li: Hong Kong Baptist University
Li-Wei Wang: Soochow University
Xulong Wang: Hong Kong Baptist University
Zhi-Kang Lin: Soochow University
Guancong Ma: Hong Kong Baptist University
Jian-Hua Jiang: Soochow University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Non-Hermitian physics has emerged as a new paradigm that profoundly changes our understanding of non-equilibrium systems, introducing novel concepts such as exceptional points, spectral topology, and non-Hermitian skin effects (NHSEs). Most existing studies focus on non-Hermitian eigenstates, whereas dynamic properties have been discussed only recently, and the dynamic NHSEs are not yet confirmed in experiments. Here, we report the experimental observation of non-Hermitian skin dynamics using tunable one-dimensional nonreciprocal double-chain mechanical systems with glide-time symmetry. Remarkably, dynamic NHSEs are observed with various behaviors in different dynamic phases, which can be understood via the generalized Brillouin zone and the related concepts. Moreover, the observed dynamic NHSEs, amplifications, bulk unidirectional wave propagation, and boundary wave trapping provide promising ways to manipulate waves in a controllable and robust way. Our findings open a new pathway toward non-Hermitian dynamics, which will fertilize the study of non-equilibrium phases of matter.

Date: 2024
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DOI: 10.1038/s41467-024-50776-1

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