| Issue |
EPL
Volume 150, Number 6, June 2025
|
|
|---|---|---|
| Article Number | 60001 | |
| Number of page(s) | 7 | |
| Section | General physics | |
| DOI | https://doi.org/10.1209/0295-5075/addf77 | |
| Published online | 20 June 2025 | |
The non-Hermitian skin effect: A perspective
1 Max Planck Institute for the Science of Light - Staudtstraße 2, 91058 Erlangen, Germany
2 Department of Physics, Friedrich-Alexander Universität Erlangen-Nürnberg - Staudtstraße 7, 91058 Erlangen, Germany
Received: 31 October 2024
Accepted: 2 June 2025
The non-Hermitian (NH) skin effect is a truly NH feature, which manifests itself as an accumulation of states, known as skin states, on the boundaries of a system. In this perspective, we discuss several aspects of the NH skin effect focusing on the most interesting facets of this phenomenon. Beyond reviewing necessary requirements to see the NH skin effect, we discuss the NH skin effect as a topological effect that can be seen as a manifestation of a truly NH bulk-boundary correspondence, stemming from the spectral topology, and show how skin states can be distinguished from topological boundary states. As most theoretical work has focused on studying the NH skin effect in one-dimensional non-interacting systems, recent developments of studying this effect in higher dimensions as well as in many-body systems are highlighted. Lastly, experimental signatures and applications are discussed, and an outlook is provided.
© 2025 The author(s)
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