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- W4313266513 abstract "Non-Hermitian topological systems simultaneously possess two antagonistic features: ultrasensitivity due to exceptional points and robustness of topological zero-energy modes, and it is unclear which one prevails under different perturbations. We study that question by applying the pseudospectrum theory on the prototypical non-Hermitian Su-Schrieffer-Heeger lattice. Topological modes around the underlying third-order exceptional point (EP3) are robust with respect to chiral perturbations but sensitive to diagonal perturbations. In fact, exactly at the EP3 the chiral symmetry leads to a suppressed sensitivity, that corresponds to an EP2. Finally, for nonlinearly induced perturbations we provide a connection between the pseudospectrum approach and a nonlinear phase shift, which is relevant for experiments." @default.
- W4313266513 created "2023-01-06" @default.
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- W4313266513 date "2022-12-29" @default.
- W4313266513 modified "2023-10-18" @default.
- W4313266513 title "Robustness versus sensitivity in non-Hermitian topological lattices probed by pseudospectra" @default.
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- W4313266513 doi "https://doi.org/10.1103/physrevresearch.4.043219" @default.
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