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From Hermitian critical to non-Hermitian point-gapped phases
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Nordic Institute for Theoretical Physics (Nordita).ORCID iD: 0000-0002-3076-8526
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Nordic Institute for Theoretical Physics (Nordita).ORCID iD: 0000-0003-2258-1945
Number of Authors: 22023 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 107, no 23, article id 235112Article in journal (Refereed) Published
Abstract [en]

Recent years have seen a growing interest in topological phases beyond the standard paradigm of gapped isolated systems. One recent direction is to explore topological features in non-Hermitian systems that are commonly used as effective descriptions of open systems. Another direction explores the fate of topology at critical points, where the bulk gap collapses. One interesting observation is that both systems, though very different, share certain topological features. For instance, both systems can host half-integer quantized winding numbers and have very similar entanglement spectra. Here we make this similarity explicit by showing the equivalence of topological invariants in critical systems with non-Hermitian point-gap phases, in the presence of sublattice symmetry. Also, the corresponding entanglement spectra show the same topological features. This correspondence may carry over to other features and even be helpful to deepen our understanding of non-Hermitian systems using our knowledge of critical systems and vice versa.

Place, publisher, year, edition, pages
2023. Vol. 107, no 23, article id 235112
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:su:diva-230632DOI: 10.1103/PhysRevB.107.235112ISI: 001012045700002Scopus ID: 2-s2.0-85163338266OAI: oai:DiVA.org:su-230632DiVA, id: diva2:1868581
Available from: 2024-06-12 Created: 2024-06-12 Last updated: 2024-06-12Bibliographically approved

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Ortega-Taberner, CarlosHermanns, Maria

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