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A symmetry-protected exceptional ring in a photonic crystal with negative index media
Takuma Isobe, Tsuneya Yoshida, Yasuhiro Hatsugai
Non-Hermitian topological band structures such as symmetry-protected exceptional rings (SPERs) can emerge for systems described by the generalized eigenvalue problem (GEVP) with He…
Fate of exceptional points under interactions: Reduction of topological classifications
Tsuneya Yoshida, Yasuhiro Hatsugai
Despite recent extensive studies of the non-Hermitian topology, understanding interaction effects is left as a crucial question. In this paper, we address interaction effects on ex…
Reduction of one-dimensional non-Hermitian point-gap topology by correlations
Tsuneya Yoshida, Yasuhiro Hatsugai
In spite of extensive works on the non-Hermitian topology, correlations effects remain crucial questions. We hereby analyze correlated non-Hermitian systems with special emphasis o…
Discriminant indicator with generalized rotational symmetry
Hiromasa Wakao, Tsuneya Yoshida, Yasuhiro Hatsugai
Discriminant indicators with generalized inversion symmetry are computed only from data at the high-symmetry points. They allow a systematic search for exceptional points. In this…