Observation of exceptional line semimetal in three-dimensional non-Hermitian phononic crystals
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866914859371724800 |
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| author | Hu, Yejian Wu, Jien Ye, Peidong Deng, Weiyin Lu, Jiuyang Huang, Xueqin Wang, Ziyu Ke, Manzhu Liu, Zhengyou |
| author_facet | Hu, Yejian Wu, Jien Ye, Peidong Deng, Weiyin Lu, Jiuyang Huang, Xueqin Wang, Ziyu Ke, Manzhu Liu, Zhengyou |
| contents | Non-Hermitian topological phases, which exhibit unique features such as skin effect and exceptional points originated from nontrivial band topologies in complex plane, have attracted enormous attention in condensed-matter physics and metamaterials. Here we report the realization of an exceptional line semimetal in a three-dimensional non-Hermitian phononic crystal. A pair of exceptional rings with opposite topologies are connected by the drumhead bulk states in the first Brillouin zone. The exceptional rings not only possess wave-function topology and thus result in the drumhead surface states, but also host spectral topology and thereby give rise to the hybrid-order geometry-dependent skin effect in three dimensions. Our experimental results evidence the complete non-Hermitian bulk-boundary correspondence of the three-dimensional exceptional line semimetal, and may pave the way for designing non-Hermitian acoustic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_03868 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation of exceptional line semimetal in three-dimensional non-Hermitian phononic crystals Hu, Yejian Wu, Jien Ye, Peidong Deng, Weiyin Lu, Jiuyang Huang, Xueqin Wang, Ziyu Ke, Manzhu Liu, Zhengyou Mesoscale and Nanoscale Physics Materials Science Non-Hermitian topological phases, which exhibit unique features such as skin effect and exceptional points originated from nontrivial band topologies in complex plane, have attracted enormous attention in condensed-matter physics and metamaterials. Here we report the realization of an exceptional line semimetal in a three-dimensional non-Hermitian phononic crystal. A pair of exceptional rings with opposite topologies are connected by the drumhead bulk states in the first Brillouin zone. The exceptional rings not only possess wave-function topology and thus result in the drumhead surface states, but also host spectral topology and thereby give rise to the hybrid-order geometry-dependent skin effect in three dimensions. Our experimental results evidence the complete non-Hermitian bulk-boundary correspondence of the three-dimensional exceptional line semimetal, and may pave the way for designing non-Hermitian acoustic devices. |
| title | Observation of exceptional line semimetal in three-dimensional non-Hermitian phononic crystals |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2407.03868 |