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Observation of dynamic non-Hermitian skin effects
Zhen Li1, Li-Wei Wang2,3,4, Xulong Wang1
1Department of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China.
Nature Communications
|August 2, 2024
Summary
Researchers experimentally observed non-Hermitian skin dynamics in mechanical systems, confirming dynamic non-Hermitian skin effects (NHSEs). This breakthrough offers new ways to control wave propagation and explore non-equilibrium physics.
Area of Science:
- Non-Hermitian physics
- Condensed matter physics
- Wave phenomena
Background:
- Non-Hermitian physics introduces concepts like exceptional points and spectral topology.
- Existing research primarily focuses on non-Hermitian eigenstates.
- Dynamic properties and dynamic non-Hermitian skin effects (NHSEs) are less explored and experimentally unconfirmed.
Purpose of the Study:
- To experimentally observe and characterize non-Hermitian skin dynamics.
- To investigate dynamic NHSEs in a tunable mechanical system.
- To explore potential applications in wave manipulation.
Main Methods:
- Utilized tunable one-dimensional nonreciprocal double-chain mechanical systems.
- Employed glide-time symmetry in the system design.
- Analyzed dynamic behaviors across different dynamic phases.
Main Results:
- Successfully observed non-Hermitian skin dynamics experimentally.
- Documented diverse behaviors of dynamic NHSEs in various phases.
- Demonstrated wave amplifications, bulk unidirectional propagation, and boundary wave trapping.
Conclusions:
- Confirmed the existence of dynamic NHSEs through experimental observation.
- The findings provide a new understanding of non-Hermitian dynamics.
- Opened new avenues for controllable and robust wave manipulation and the study of non-equilibrium matter phases.
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