Exact open-boundary solution of a spin-orbit-coupled Hatano-Nelson chain shows a momentum-dependent identity term deforms the GBZ and induces topological edge states and zero modes without chiral symmetry.
island” in the sense that it is completely surrounded by trivial regions. The region containing point II, by contrast, is a “peninsula
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Non-Hermitian topology driven by an identity term: An exactly solvable paradigm
Exact open-boundary solution of a spin-orbit-coupled Hatano-Nelson chain shows a momentum-dependent identity term deforms the GBZ and induces topological edge states and zero modes without chiral symmetry.