Construction and Observation of Flexibly Controllable High-Dimensional Non-Hermitian Skin Effects
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866914824463581184 |
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| author | Zhang, Qicheng Leng, Yufei Xiong, Liwei Li, Yuzeng Zhang, Kun Qi, Liangjun Qiu, Chunyin |
| author_facet | Zhang, Qicheng Leng, Yufei Xiong, Liwei Li, Yuzeng Zhang, Kun Qi, Liangjun Qiu, Chunyin |
| contents | Non-Hermitian skin effect (NHSE) is one of the most fundamental phenomena in non-Hermitian physics. Although it is established that one-dimensional NHSE originates from the nontrivial spectral winding topology, the topological origin behind the higher-dimensional NHSE remains unclear so far. This poses a substantial challenge in constructing and manipulating high-dimensional NHSEs. Here, an intuitive bottom-to-top scheme to construct high-dimensional NHSEs is proposed, through assembling multiple independent one-dimensional NHSEs. Not only the elusive high-dimensional NHSEs can be effectively predicted from the well-defined one-dimensional spectral winding topologies, but also the high-dimensional generalized Brillouin zones can be directly synthesized from the one-dimensional counterparts. As examples, two two-dimensional nonreciprocal acoustic metamaterials are experimentally implemented to demonstrate highly controllable multi-polar NHSEs and hybrid skin-topological effects, where the sound fields can be frequency-selectively localized at any desired corners and boundaries. These results offer a practicable strategy for engineering high-dimensional NHSEs, which could boost advanced applications such as selective filters and directional amplifiers. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_02593 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Construction and Observation of Flexibly Controllable High-Dimensional Non-Hermitian Skin Effects Zhang, Qicheng Leng, Yufei Xiong, Liwei Li, Yuzeng Zhang, Kun Qi, Liangjun Qiu, Chunyin Classical Physics Materials Science Other Condensed Matter Applied Physics Non-Hermitian skin effect (NHSE) is one of the most fundamental phenomena in non-Hermitian physics. Although it is established that one-dimensional NHSE originates from the nontrivial spectral winding topology, the topological origin behind the higher-dimensional NHSE remains unclear so far. This poses a substantial challenge in constructing and manipulating high-dimensional NHSEs. Here, an intuitive bottom-to-top scheme to construct high-dimensional NHSEs is proposed, through assembling multiple independent one-dimensional NHSEs. Not only the elusive high-dimensional NHSEs can be effectively predicted from the well-defined one-dimensional spectral winding topologies, but also the high-dimensional generalized Brillouin zones can be directly synthesized from the one-dimensional counterparts. As examples, two two-dimensional nonreciprocal acoustic metamaterials are experimentally implemented to demonstrate highly controllable multi-polar NHSEs and hybrid skin-topological effects, where the sound fields can be frequency-selectively localized at any desired corners and boundaries. These results offer a practicable strategy for engineering high-dimensional NHSEs, which could boost advanced applications such as selective filters and directional amplifiers. |
| title | Construction and Observation of Flexibly Controllable High-Dimensional Non-Hermitian Skin Effects |
| topic | Classical Physics Materials Science Other Condensed Matter Applied Physics |
| url | https://arxiv.org/abs/2406.02593 |