Higher-order exceptional ring semimetal with real hinge states in acoustic metamaterialsOA
Non-Hermitian topological phase,with the novel concepts such as exceptional points and the skin effect,has opened up a new paradigm beyond Hermitian topological physics.Exceptional ring semimetal,featured by a stable ring of exceptional points in three dimensions,exhibits first-order topological properties,including topological surface states and a surface-dependent skin effect.Nevertheless,despite extensive research on Hermitian higher-order insulators and semimetals,higher-order exceptional ring semimetal is just emerging.Here,we report the first realization of a higher-order Weyl exceptional ring semimetal in a three-dimensional lossy acoustic metamaterial.The non-Hermitian higher-order topology is reflected in the topological hinge states and a hinge-dependent skin effect.Counterintuitively,the topological hinge states maintain purely real energy even under a high loss level,ensuring robust hinge-state propagation.Our findings evidence the non-Hermitian higher-order bulk-boundary correspondence of exceptional ring semimetal,and may pave the way for non-Hermitian functional acoustic devices.
Yejian Hu;Zhenhang Pu;Xiangru Chen;Yuxiang Xi;Jiuyang Lu;Weiyin Deng;Manzhu Ke;Zhengyou Liu
Key Laboratory of Artificial Micro-and Nanostructures of Ministry of Education and School of Physics and Technology,Wuhan University,Wuhan 430072,ChinaKey Laboratory of Artificial Micro-and Nanostructures of Ministry of Education and School of Physics and Technology,Wuhan University,Wuhan 430072,ChinaKey Laboratory of Artificial Micro-and Nanostructures of Ministry of Education and School of Physics and Technology,Wuhan University,Wuhan 430072,ChinaKey Laboratory of Artificial Micro-and Nanostructures of Ministry of Education and School of Physics and Technology,Wuhan University,Wuhan 430072,ChinaKey Laboratory of Artificial Micro-and Nanostructures of Ministry of Education and School of Physics and Technology,Wuhan University,Wuhan 430072,ChinaKey Laboratory of Artificial Micro-and Nanostructures of Ministry of Education and School of Physics and Technology,Wuhan University,Wuhan 430072,ChinaKey Laboratory of Artificial Micro-and Nanostructures of Ministry of Education and School of Physics and Technology,Wuhan University,Wuhan 430072,ChinaKey Laboratory of Artificial Micro-and Nanostructures of Ministry of Education and School of Physics and Technology,Wuhan University,Wuhan 430072,China Institute for Advanced Studies,Wuhan University,Wuhan 430072,China
数理科学
exceptional ringhigher-order topologynon-Hermitian systemsacoustic metamaterials
《National Science Review》 2026 (11)
P.294-300,7
supported by the National Key R&D Program of China(2022YFA1404500,2022YFA1404900 and 2023YFB2804701)the National Natural Science Foundation of China(12374409,12574024,12504250,12574484 and U25D8001)the Hubei Provincial Natural Science Foundation of China(2025AFB051)the China Postdoctoral Science Foundation(2024M752453)the Postdoctoral Fellowship Program of CPSF(GZB20240575).
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