Non-Hermitian corner skin effect in a two-dimensional photonic crystal
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866915958176612352 |
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| author | Phan, Huyen Thanh Wakabayashi, Katsunori |
| author_facet | Phan, Huyen Thanh Wakabayashi, Katsunori |
| contents | We numerically study topological effects of electromagnetic (EM) waves
in a two-dimensional (2D) non-Hermitian photonic crystal (PhC) composed
of lossy magneto-optical materials. In this system, not only the EM
wavefunctions but also the complex eigenfrequencies exhibit nontrivial
topological properties. We demonstrate that the non-Hermitian skin
effect, protected by point gaps in the complex eigenfrequency spectrum,
emerges at both the edges and corners of truncated structures. This
phenomenon has no counterpart in Hermitian systems. In addition, we identify non-Hermitian topological edge states
originating from the nontrivial topology of the bulk bands. While most
previous studies of non-Hermitian topology have focused on
tight-binding models, our work addresses a continuous photonic system,
providing a more realistic platform and offering a concrete route
toward experimental realization of non-Hermitian effects. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_23209 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Non-Hermitian corner skin effect in a two-dimensional photonic crystal Phan, Huyen Thanh Wakabayashi, Katsunori Optics Mesoscale and Nanoscale Physics Materials Science We numerically study topological effects of electromagnetic (EM) waves in a two-dimensional (2D) non-Hermitian photonic crystal (PhC) composed of lossy magneto-optical materials. In this system, not only the EM wavefunctions but also the complex eigenfrequencies exhibit nontrivial topological properties. We demonstrate that the non-Hermitian skin effect, protected by point gaps in the complex eigenfrequency spectrum, emerges at both the edges and corners of truncated structures. This phenomenon has no counterpart in Hermitian systems. In addition, we identify non-Hermitian topological edge states originating from the nontrivial topology of the bulk bands. While most previous studies of non-Hermitian topology have focused on tight-binding models, our work addresses a continuous photonic system, providing a more realistic platform and offering a concrete route toward experimental realization of non-Hermitian effects. |
| title | Non-Hermitian corner skin effect in a two-dimensional photonic crystal |
| topic | Optics Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2604.23209 |