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Article: Topological classification for intersection singularities of exceptional surfaces in pseudo-Hermitian systems

TitleTopological classification for intersection singularities of exceptional surfaces in pseudo-Hermitian systems
Authors
Issue Date13-Oct-2023
PublisherNature Research
Citation
Communications Physics, 2023, v. 6, n. 1, p. 1-8 How to Cite?
AbstractNon-Hermitian systems are known for their intriguing topological properties, which underpin various exotic physical phenomena. Exceptional points, in particular, play a pivotal role in fine-tuning these systems for optimal device functionality and material characteristics. These points can give rise to exceptional surfaces with embedded lower-dimensional non-isolated singularities. Here we introduce a topological classification for non-defective intersection lines of exceptional surfaces, where exceptional surfaces intersect transversally. We achieve this classification by constructing a quotient space of an order-parameter space under equivalence relations of eigenstates. We unveil that the fundamental group of these gapless structures is a non-Abelian group on three generators. This classification not only reveals a unique form of non-Hermitian gapless phases featuring a chain of non-defective intersection lines but also predicts the unexpected existence of topological edge states in one-dimensional lattice models protected by the intersection singularities. Our classification opens avenues for realizing robust topological phases.Non-Hermitian physics expands the range of exotic features that can be explored in non-trivial topological systems and exceptional points play a prominent role. Here, the authors report a topological classification of the intersections of exceptional surfaces and predicted topologically protected edge states that arise from the intersections.
Persistent Identifierhttp://hdl.handle.net/10722/340779
ISSN
2023 Impact Factor: 5.4
2023 SCImago Journal Rankings: 1.761
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorJia, HW-
dc.contributor.authorZhang, RY-
dc.contributor.authorHu, J-
dc.contributor.authorXiao, YX-
dc.contributor.authorZhang, S-
dc.contributor.authorZhu, YF-
dc.contributor.authorChan, CT-
dc.date.accessioned2024-03-11T10:47:03Z-
dc.date.available2024-03-11T10:47:03Z-
dc.date.issued2023-10-13-
dc.identifier.citationCommunications Physics, 2023, v. 6, n. 1, p. 1-8-
dc.identifier.issn2399-3650-
dc.identifier.urihttp://hdl.handle.net/10722/340779-
dc.description.abstractNon-Hermitian systems are known for their intriguing topological properties, which underpin various exotic physical phenomena. Exceptional points, in particular, play a pivotal role in fine-tuning these systems for optimal device functionality and material characteristics. These points can give rise to exceptional surfaces with embedded lower-dimensional non-isolated singularities. Here we introduce a topological classification for non-defective intersection lines of exceptional surfaces, where exceptional surfaces intersect transversally. We achieve this classification by constructing a quotient space of an order-parameter space under equivalence relations of eigenstates. We unveil that the fundamental group of these gapless structures is a non-Abelian group on three generators. This classification not only reveals a unique form of non-Hermitian gapless phases featuring a chain of non-defective intersection lines but also predicts the unexpected existence of topological edge states in one-dimensional lattice models protected by the intersection singularities. Our classification opens avenues for realizing robust topological phases.Non-Hermitian physics expands the range of exotic features that can be explored in non-trivial topological systems and exceptional points play a prominent role. Here, the authors report a topological classification of the intersections of exceptional surfaces and predicted topologically protected edge states that arise from the intersections.-
dc.languageeng-
dc.publisherNature Research-
dc.relation.ispartofCommunications Physics-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.titleTopological classification for intersection singularities of exceptional surfaces in pseudo-Hermitian systems-
dc.typeArticle-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1038/s42005-023-01417-4-
dc.identifier.scopuseid_2-s2.0-85174261911-
dc.identifier.volume6-
dc.identifier.issue1-
dc.identifier.spage1-
dc.identifier.epage8-
dc.identifier.eissn2399-3650-
dc.identifier.isiWOS:001095783900004-
dc.publisher.placeBERLIN-
dc.identifier.issnl2399-3650-

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