Pseudospin induced topological corner state at intersecting sonic lattices

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Show simple item record Zhang, Zhiwang Hu, Bolun Liu, Feng Cheng, Ying Liu, Xiaojun Christensen, Johan 2020-12-11T10:20:44Z 2020-12-11T10:20:44Z 2020-06-02
dc.identifier.bibliographicCitation Physical Review, B, (2020), 101(22), 220102(R), pp.: 1-6.
dc.identifier.issn 1098-0121
dc.description.abstract Inspired by the discoveries of electronic topological phases and topological insulators, topologically protected boundary states in classical wave-based systems have attracted considerable interest in the last decade. Most recently, acoustic higher-order topological insulators and Kekulé-distorted sonic lattices have been proposed to support topological corner states and zero-dimensional bound states. Here, we demonstrate a domain wall induced topological corner state that is bound at the crossing point among finite acoustic graphenelike crystals. The approach is based on designing multipolar pseudospin resonances, which give rise to topologically trivial and nontrivial transitions across the domain walls that flank this unusual corner excitation toward the crossing point. By deliberately adding a substantial amount of defects into the cavities of the sonic lattice, we find that the pseudospin induced topological corner state remains entirely unaffected and pinned spectrally to the complete audible band gap. Our findings may thus have the potential to broaden the possibilities for sound confinement and focusing.
dc.description.sponsorship This work was supported by National Key R&D Program of China (Grant No. 2017YFA0303702), NSFC (Grants No. 11922407, No. 11834008, No. 11874215, and No. 11674172), Jiangsu Provincial NSF (BK20160018) and the Fundamental Research Funds for the Central Universities (Grant No. 020414380001). J.C. acknowledges the support from the European Research Council (ERC) through the Starting Grant No. 714577 PHONOMETA and from the MINECO through a Ramón y Cajal grant (Grant No. RYC-2015-17156).
dc.format.extent 6
dc.language.iso eng
dc.publisher American Physical Society
dc.rights ©2020 American Physical Society.
dc.subject.other Acoustic metamaterials
dc.subject.other Acoustic wave phenomena
dc.subject.other Topological insulators
dc.subject.other Honeycomb lattice
dc.title Pseudospin induced topological corner state at intersecting sonic lattices
dc.type article
dc.description.status Publicado
dc.subject.eciencia Física
dc.subject.eciencia Matemáticas
dc.rights.accessRights openAccess
dc.relation.projectID info:eu-repo/grantAgreement/EC/H2020/714577/PHONOMETA
dc.relation.projectID Gobierno de España. RYC-2015-17156
dc.type.version publishedVersion
dc.identifier.publicationfirstpage 1
dc.identifier.publicationissue 22, 220102
dc.identifier.publicationlastpage 6
dc.identifier.publicationtitle PHYSICAL REVIEW B
dc.identifier.publicationvolume 101
dc.identifier.uxxi AR/0000026435
dc.contributor.funder Ministerio de Economía y Competitividad (España)
dc.contributor.funder European Commission
dc.affiliation.dpto UC3M. Departamento de Física
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