Journal
PHYSICAL REVIEW LETTERS
Volume 124, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.086801
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Funding
- Japan Society for the Promotion of Science (JSPS) [JP15H05855]
- JST CREST, Japan [JPMJCR19T2]
- KAKENHI from JSPS [JP18J01610, JP19J21927, JP17H02922]
- PRESTO, JST [JPMJPR18L4]
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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.
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