Publication:
Deep-subwavelength holey acoustic second-order topological insulators

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dc.affiliation.dptoUC3M. Departamento de Físicaes
dc.contributor.authorZhang, Zhiwang
dc.contributor.authorLong, Houyou
dc.contributor.authorLiu, Chen
dc.contributor.authorShao, Chen
dc.contributor.authorCheng, Ying
dc.contributor.authorLiu, Xiaojun
dc.contributor.authorChristensen, Johan
dc.contributor.funderEuropean Commissionen
dc.contributor.funderMinisterio de Economía y Competitividad (España)es
dc.date.accessioned2020-12-01T10:59:17Z
dc.date.available2020-12-01T10:59:17Z
dc.date.issued2019-12-06
dc.description.abstractHigher-order topological insulators (HOTIs) belong to a new class of materials with unusual topological phases. They have garnered considerable attention due to their capabilities in confining energy at the hinges and corners, which is entirely protected by the topology, and have thus become attractive structures for acoustic wave studies and control. However, for most practical applications at audible and low frequencies, compact and subwavelength implementations are desirable in addition to providing robust guiding of sound beyond a single-frequency operation. Here, a holey HOTI capable of sustaining deeply confined corner states 50 times smaller than the wavelength is proposed. A remarkable resilience of these surface-confined acoustic states against defects is experimentally observed, and topologically protected sound is demonstrated in three different frequency regimes. Concerning this matter, the findings will thus have the capability to push forward exciting applications for robust acoustic imaging way beyond the diffraction limit.en
dc.description.sponsorshipThis work was supported by the National Key R&D Program of China (2017YFA0303702), NSFC (11922407, 11834008, 11874215, 11674172, and 11574148), Jiangsu Provincial NSF (BK20160018), the Fundamental Research Funds for the Central Universities (020414380001), and Nanjing University Innovation and Creative Program for Ph.D. candidate (CXCY17-11). Z.Z. acknowledges the support from the China Scholarship Council. J.C. acknowledges the support from the European Research Council (ERC) through the Starting Grant 714577 PHONOMETA and from the MINECO through a Ramón y Cajal grant (Grant No. RYC-2015-17156).en
dc.format.extent7
dc.identifier.bibliographicCitationAdvanced Materials , 31(49), 1904682, Dec. 2019, 7 pp.en
dc.identifier.doihttps://doi.org/10.1002/adma.201904682
dc.identifier.issn0935-9648
dc.identifier.issn1521-4095 (online)
dc.identifier.publicationfirstpage1es
dc.identifier.publicationissue49, 1904682es
dc.identifier.publicationlastpage7es
dc.identifier.publicationtitleADVANCED MATERIALSen
dc.identifier.publicationvolume31es
dc.identifier.urihttps://hdl.handle.net/10016/31511
dc.identifier.uxxiAR/0000024369
dc.language.isoengen
dc.publisherWiley-VCH Verlag GmbH & Co.en
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/H2020/714577/PHONOMETAen
dc.relation.projectIDGobierno de España. RYC-2015-17156es
dc.rights© 2019 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.en
dc.rightsThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.en
dc.rightsAtribución 3.0 España*
dc.rights.accessRightsopen accessen
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/es/*
dc.subject.otherDeep-Subwavelength Acoustic Imagingen
dc.subject.otherPhononic crystalses
dc.subject.otherSecond-order topological insulatorsen
dc.subject.otherSpoof surface acoustic wavesen
dc.subject.otherTopological corner statesen
dc.titleDeep-subwavelength holey acoustic second-order topological insulatorsen
dc.typeresearch article*
dc.type.hasVersionVoR*
dspace.entity.typePublication
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