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We numerically study topological effects of electromagnetic (EM) waves in a two-dimensional non-Hermitian photonic crystal composed of lossy magneto-optical materials. In this system, not only the EM wave functions 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.

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• In Copyright
  

  ©2026 American Physical Society

Keyword: Non-Hermitian photonic crystal, Corner skin effect, Point-gap topology, Topological edge states, Complex eigenfrequency spectrum

Date published: 2026-05-01

Publisher: American Physical Society (APS)

Journal:

• Physical Review B (ISSN: 24699950) vol. 113 issue. 20 205403

Funding:

• Japan Science and Technology Corporation JPMJCR19T1
• Sumitomo Foundation 2401203
• Japan Society for the Promotion of Science JP25K01609
• Japan Society for the Promotion of Science JP22H05473
• Japan Society for the Promotion of Science JP21H01019

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6375

First published URL: https://doi.org/10.1103/gvcy-vsvd

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Updated at: 2026-06-29 10:01:31 +0900

Published on MDR: 2026-06-29 12:29:15 +0900