The non-Hermitian skin effect originates from spectral instability and non-reciprocity instead of point-gap winding of the Bloch Hamiltonian.
Sirker, Bulk-boundary correspondence in topological two-dimensional non-hermitian systems: Toeplitz opera- tors and singular values (2026)
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Pseudospectral phenomena and the origin of the non-Hermitian skin effect
The non-Hermitian skin effect originates from spectral instability and non-reciprocity instead of point-gap winding of the Bloch Hamiltonian.