Authors
Mingyu Tong, Yuze Hu, Yang Wang, Qiaolu Chen, Li Zhang, Fujia Chen, Junyao Wu, Yaqi Li, Xinrui Li, Ning Han, Yuang Pan, Zhi-Ming Yu, Hongsheng Chen, Yihao Yang
Published in
Science bulletin. Sep 17, 2026. Epub Sep 17, 2026.
Abstract
Non-Hermitian dynamics offer promising ways to study the non-equilibrium phase of matter, such as chiral Zener tunneling, non-Bloch dynamics, and dynamic non-Hermitian skin effects, phenomena that cannot be fully captured by static eigenstate descriptions alone. Dynamic degeneracy splitting (DDS), which reveals the dynamic consequence caused by the uneven broadening of equal-frequency contours at a given excitation frequency, assists in investigating non-Hermitian dynamics. However, under reciprocity constraints, the theoretical and experimental studies of previous research on DDS have primarily focused on structures that exhibit centrosymmetric band structure and lifetime, leaving the distinctive phenomena associated with nonreciprocity largely unexplored. Here, we propose and realize nonreciprocal DDS through anisotropic damping of hyperbolic-like bands, induced by sequential symmetry breaking in a photonic crystal. This nonreciprocal DDS enables directional transmission via momentum-selective excitation in a stripe geometry and directional imaging in a slab geometry through anomalous negative refraction. These findings unify the concepts of nonreciprocity, non-Hermiticity, and dissipation anisotropy, demonstrating the opportunities enabled by artificial materials through symmetry engineering for tunable, highly directional wave propagation.
PMID:
42850120
Bibliographic data and abstract were imported from PubMed on 09 Oct 2026.
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