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Article: Observation of Non-Abelian Nodal Links in Photonics

TitleObservation of Non-Abelian Nodal Links in Photonics
Authors
Issue Date2020
Citation
Physical Review Letters, 2020, v. 125, n. 3, article no. 033901 How to Cite?
Abstract© 2020 American Physical Society. In crystals, two bands may cross each other and form degeneracies along a closed loop in the three-dimensional momentum space, which is called nodal line. Nodal line degeneracy can be designed to exhibit various configurations such as nodal rings, chains, links, and knots. Very recently, non-Abelian band topology was proposed in nodal link systems, where the nodal lines formed by consecutive pairs of bands exhibit interesting braiding structures and the underlying topological charges are described by quaternions. Here, we experimentally demonstrate non-Abelian nodal links in a biaxial hyperbolic metamaterial. The linked nodal lines threading through each other are formed by the crossings between three adjacent bands. Based on the non-Abelian charges, we further analyze various admissible nodal link configurations for the three-band system. On the interface between the metamaterial and air, surface bound states in the continuum are observed, which serves as the symmetry-enforced derivative of drumhead surface states from the linked nodal lines. Our work serves as a direct observation of the global topological structures of nodal links, and provides a platform for studying non-Abelian topological charge in the momentum space.
Persistent Identifierhttp://hdl.handle.net/10722/295175
ISSN
2020 Impact Factor: 9.161
2015 SCImago Journal Rankings: 3.731
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYang, Erchan-
dc.contributor.authorYang, Biao-
dc.contributor.authorYou, Oubo-
dc.contributor.authorChan, Hsun Chi-
dc.contributor.authorMao, Peng-
dc.contributor.authorGuo, Qinghua-
dc.contributor.authorMa, Shaojie-
dc.contributor.authorXia, Lingbo-
dc.contributor.authorFan, Dianyuan-
dc.contributor.authorXiang, Yuanjiang-
dc.contributor.authorZhang, Shuang-
dc.date.accessioned2021-01-05T04:59:13Z-
dc.date.available2021-01-05T04:59:13Z-
dc.date.issued2020-
dc.identifier.citationPhysical Review Letters, 2020, v. 125, n. 3, article no. 033901-
dc.identifier.issn0031-9007-
dc.identifier.urihttp://hdl.handle.net/10722/295175-
dc.description.abstract© 2020 American Physical Society. In crystals, two bands may cross each other and form degeneracies along a closed loop in the three-dimensional momentum space, which is called nodal line. Nodal line degeneracy can be designed to exhibit various configurations such as nodal rings, chains, links, and knots. Very recently, non-Abelian band topology was proposed in nodal link systems, where the nodal lines formed by consecutive pairs of bands exhibit interesting braiding structures and the underlying topological charges are described by quaternions. Here, we experimentally demonstrate non-Abelian nodal links in a biaxial hyperbolic metamaterial. The linked nodal lines threading through each other are formed by the crossings between three adjacent bands. Based on the non-Abelian charges, we further analyze various admissible nodal link configurations for the three-band system. On the interface between the metamaterial and air, surface bound states in the continuum are observed, which serves as the symmetry-enforced derivative of drumhead surface states from the linked nodal lines. Our work serves as a direct observation of the global topological structures of nodal links, and provides a platform for studying non-Abelian topological charge in the momentum space.-
dc.languageeng-
dc.relation.ispartofPhysical Review Letters-
dc.titleObservation of Non-Abelian Nodal Links in Photonics-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1103/PhysRevLett.125.033901-
dc.identifier.pmid32745405-
dc.identifier.scopuseid_2-s2.0-85089043535-
dc.identifier.volume125-
dc.identifier.issue3-
dc.identifier.spagearticle no. 033901-
dc.identifier.epagearticle no. 033901-
dc.identifier.eissn1079-7114-
dc.identifier.isiWOS:000548060700008-
dc.identifier.issnl0031-9007-

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