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Edge modes, degeneracies, and topological numbers in non-Hermitian systems

Leykam, Daniel; Bliokh, Konstantin Y; Huang, Chunli; Chong, Y D; Nori, Franco


We analyze chiral topological edge modes in a non-Hermitian variant of the 2D Dirac equation. Such modes appear at interfaces between media with different "masses" and/or signs of the "non-Hermitian charge." The existence of these edge modes is intimately related to exceptional points of the bulk Hamiltonians, i.e., degeneracies in the bulk spectra of the media. We find that the topological edge modes can be divided into three families ("Hermitian-like," "non-Hermitian," and "mixed"); these are...[Show more]

CollectionsANU Research Publications
Date published: 2017-01-27
Type: Journal article
Source: Physical review letters
DOI: 10.1103/PhysRevLett.118.040401
Access Rights: Open Access


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