Observation of dynamic non-Hermitian skin effects

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, wherea...

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Bibliographic Details
Published in:Nature communications 2024-08, Vol.15 (1), p.6544-9, Article 6544
Main Authors: Li, Zhen, Wang, Li-Wei, Wang, Xulong, Lin, Zhi-Kang, Ma, Guancong, Jiang, Jian-Hua
Format: Article
Language:English
Subjects:
639/301/1019/1015
639/766/25/3927
Brillouin zones
Controllability
Dynamic characteristics
Eigenvectors
Humanities and Social Sciences
Inertia
Mechanical properties
Mechanical systems
multidisciplinary
Phase transitions
Phases
Physics
Propagation
Robust control
Science
Science (multidisciplinary)
Skin
Skin effect
Symmetry
Topology
Wave propagation
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Summary: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. Characterizing and classifying dynamic non-Hermitian skin effect is a key challenge in nonHermitian physics. Here, authors illustrated rich non-Hermitian skin dynamics and dynamic phases in one-dimensional systems with glide-time reversal symmetry.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-024-50776-1