Observation of localization reversal and harmonic generation in nonlinear non-Hermitian skin effect
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909855325880320 |
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| author | Wu, Junyao Shen, Rui-Chang Zhang, Li Chen, Fujia Wang, Bingbing Chen, Hongsheng Yang, Yihao Xue, Haoran |
| author_facet | Wu, Junyao Shen, Rui-Chang Zhang, Li Chen, Fujia Wang, Bingbing Chen, Hongsheng Yang, Yihao Xue, Haoran |
| contents | The interplay between band topology and material nonlinearity gives rise to a variety of novel phenomena, such as topological solitons and nonlinearity-induced topological phase transitions. However, most previous studies fall within the Hermitian regime, leaving the impact of nonlinearity on non-Hermitian topology seldom explored. Here, we investigate the effects of nonlinearity on the non-Hermitian skin effect, a well-known non-Hermitian phenomenon induced by the point-gap topology unique to non-Hermitian systems. Interestingly, we discover a nonlinearity-induced point-gap topological phase transition accompanied by a reversal of the skin mode localization, which is distinct from previous nonlinearity-induced line-gap topological phases. This phenomenon is experimentally demonstrated in a nonlinear microwave metamaterial, where electromagnetic waves are localized around one end of the sample under a low-intensity pump, whereas at a high-intensity pump, the waves are localized around the other end. Our results open a new route towards nonlinear topological physics in non-Hermitian systems and are promising for reconfigurable topological wave manipulation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_09179 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of localization reversal and harmonic generation in nonlinear non-Hermitian skin effect Wu, Junyao Shen, Rui-Chang Zhang, Li Chen, Fujia Wang, Bingbing Chen, Hongsheng Yang, Yihao Xue, Haoran Mesoscale and Nanoscale Physics The interplay between band topology and material nonlinearity gives rise to a variety of novel phenomena, such as topological solitons and nonlinearity-induced topological phase transitions. However, most previous studies fall within the Hermitian regime, leaving the impact of nonlinearity on non-Hermitian topology seldom explored. Here, we investigate the effects of nonlinearity on the non-Hermitian skin effect, a well-known non-Hermitian phenomenon induced by the point-gap topology unique to non-Hermitian systems. Interestingly, we discover a nonlinearity-induced point-gap topological phase transition accompanied by a reversal of the skin mode localization, which is distinct from previous nonlinearity-induced line-gap topological phases. This phenomenon is experimentally demonstrated in a nonlinear microwave metamaterial, where electromagnetic waves are localized around one end of the sample under a low-intensity pump, whereas at a high-intensity pump, the waves are localized around the other end. Our results open a new route towards nonlinear topological physics in non-Hermitian systems and are promising for reconfigurable topological wave manipulation. |
| title | Observation of localization reversal and harmonic generation in nonlinear non-Hermitian skin effect |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2505.09179 |