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- W3103065796 abstract "Spectra of bulk or edges in topological insulators are often made complex by non-Hermiticity. Here, we show that symmetry protection enables entirely real spectra for both bulk and edges even in non-Hermitian topological insulators. In particular, we demonstrate entirely real spectra without non-Hermitian skin effects due to a combination of pseudo-Hermiticity and Kramers degeneracy. This protection relies on nonspatial fundamental symmetry and has stability against disorder. As an illustrative example, we investigate a non-Hermitian extension of the Bernevig-Hughes-Zhang model. The helical edge states exhibit oscillatory dynamics due to their nonorthogonality as a unique non-Hermitian feature." @default.
- W3103065796 created "2020-11-23" @default.
- W3103065796 creator A5075726145 @default.
- W3103065796 creator A5090726255 @default.
- W3103065796 date "2020-09-10" @default.
- W3103065796 modified "2023-10-17" @default.
- W3103065796 title "Real spectra in non-Hermitian topological insulators" @default.
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