Topological Origin of Non-Hermitian Skin Effects

A unique feature of non-Hermitian systems is the skin effect, which is the extreme sensitivity to the boundary conditions. Here, we reveal that the skin effect originates from intrinsic non-Hermitian topology. Such a topological origin not merely explains the universal feature of the known skin effe...

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Veröffentlicht in:Physical review letters 2020-02, Vol.124 (8), p.086801-086801, Article 086801
Hauptverfasser: Okuma, Nobuyuki, Kawabata, Kohei, Shiozaki, Ken, Sato, Masatoshi
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Sprache:eng
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Zusammenfassung:A unique feature of non-Hermitian systems is the skin effect, which is the extreme sensitivity to the boundary conditions. Here, we reveal that the skin effect originates from intrinsic non-Hermitian topology. Such a topological origin not merely explains the universal feature of the known skin effect, but also leads to new types of the skin effects-symmetry-protected skin effects. In particular, we discover the Z_{2} skin effect protected by time-reversal symmetry. On the basis of topological classification, we also discuss possible other skin effects in arbitrary dimensions. Our work provides a unified understanding about the bulk-boundary correspondence and the skin effects in non-Hermitian systems.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.124.086801