Higher-order exceptional ring semimetal with real hinge states in phononic crystals
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911338906779648 |
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| author | Hu, Yejian Pu, Zhenhang Chen, Xiangru Xi, Yuxiang Lu, Jiuyang Deng, Weiyin Ke, Manzhu Liu, Zhengyou |
| author_facet | Hu, Yejian Pu, Zhenhang Chen, Xiangru Xi, Yuxiang Lu, Jiuyang Deng, Weiyin Ke, Manzhu Liu, Zhengyou |
| contents | Non-Hermitian topological phase, with the novel concepts such as exceptional points and 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 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 phononic crystal. The non-Hermitian higher-order topology reflects in the topological hinge states and 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 to non-Hermitian functional acoustic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_21557 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Higher-order exceptional ring semimetal with real hinge states in phononic crystals Hu, Yejian Pu, Zhenhang Chen, Xiangru Xi, Yuxiang Lu, Jiuyang Deng, Weiyin Ke, Manzhu Liu, Zhengyou Mesoscale and Nanoscale Physics Non-Hermitian topological phase, with the novel concepts such as exceptional points and 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 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 phononic crystal. The non-Hermitian higher-order topology reflects in the topological hinge states and 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 to non-Hermitian functional acoustic devices. |
| title | Higher-order exceptional ring semimetal with real hinge states in phononic crystals |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2512.21557 |