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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2604.00888 |
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| _version_ | 1866908931033399296 |
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| author | Tang, Huiyan Zhang, Yaxuan Wang, Ziteng Tang, Liqin Song, Daohong Xu, Jingjun Zhang, Weixuan Buljan, Hrvoje Zhang, Xiangdong Chen, Zhigang |
| author_facet | Tang, Huiyan Zhang, Yaxuan Wang, Ziteng Tang, Liqin Song, Daohong Xu, Jingjun Zhang, Weixuan Buljan, Hrvoje Zhang, Xiangdong Chen, Zhigang |
| contents | The non-Hermitian skin effect (NHSE), characterized by extensive boundary accumulation of eigenstates under open boundary conditions, has emerged as a central phenomenon in non-Hermitian physics. Conventionally, the NHSE arises from either non-reciprocal couplings or onsite gain and loss combined with synthetic gauge fields. Existing studies, however, have been largely confined to frameworks with Abelian-coupling, leaving the role of non-Abelian couplings essentially unexplored. Here, we demonstrate that non-Abelian-couplings can generate the NHSE, giving rise to a time-reversal-symmetry-protected Z2 skin effect with pseudospin-dependent boundary localization and dynamical pseudospin separation. Experimentally, we implement a representative four-level model using a programmable topolectrical circuit and directly observe both the predicted NHSE and the boundary-induced pseudospin-inversion reflection. Our work establishes a fundamental link between non-Abelian coupling and non-Hermitian topology, opening new avenues for realizing non-reciprocity-free topological materials and devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_00888 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A Non-Abelian Route to Z2 Non-Hermitian Skin Effects Tang, Huiyan Zhang, Yaxuan Wang, Ziteng Tang, Liqin Song, Daohong Xu, Jingjun Zhang, Weixuan Buljan, Hrvoje Zhang, Xiangdong Chen, Zhigang Optics The non-Hermitian skin effect (NHSE), characterized by extensive boundary accumulation of eigenstates under open boundary conditions, has emerged as a central phenomenon in non-Hermitian physics. Conventionally, the NHSE arises from either non-reciprocal couplings or onsite gain and loss combined with synthetic gauge fields. Existing studies, however, have been largely confined to frameworks with Abelian-coupling, leaving the role of non-Abelian couplings essentially unexplored. Here, we demonstrate that non-Abelian-couplings can generate the NHSE, giving rise to a time-reversal-symmetry-protected Z2 skin effect with pseudospin-dependent boundary localization and dynamical pseudospin separation. Experimentally, we implement a representative four-level model using a programmable topolectrical circuit and directly observe both the predicted NHSE and the boundary-induced pseudospin-inversion reflection. Our work establishes a fundamental link between non-Abelian coupling and non-Hermitian topology, opening new avenues for realizing non-reciprocity-free topological materials and devices. |
| title | A Non-Abelian Route to Z2 Non-Hermitian Skin Effects |
| topic | Optics |
| url | https://arxiv.org/abs/2604.00888 |