Deep-subwavelength holey acoustic second-order topological insulators

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dc.contributor.author Zhang, Zhiwang
dc.contributor.author Long, Houyou
dc.contributor.author Liu, Chen
dc.contributor.author Shao, Chen
dc.contributor.author Cheng, Ying
dc.contributor.author Liu, Xiaojun
dc.contributor.author Christensen, Johan
dc.date.accessioned 2020-12-01T10:59:17Z
dc.date.available 2020-12-01T10:59:17Z
dc.date.issued 2019-12-06
dc.identifier.bibliographicCitation Advanced Materials , 31(49), 1904682, Dec. 2019, 7 pp.
dc.identifier.issn 0935-9648
dc.identifier.issn 1521-4095 (online)
dc.identifier.uri http://hdl.handle.net/10016/31511
dc.description.abstract Higher-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.
dc.description.sponsorship This 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).
dc.format.extent 7
dc.language.iso eng
dc.publisher Wiley-VCH Verlag GmbH & Co.
dc.rights © 2019 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
dc.rights This 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.
dc.rights Atribución 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by/3.0/es/
dc.subject.other Deep-Subwavelength Acoustic Imaging
dc.subject.other Phononic crystals
dc.subject.other Second-order topological insulators
dc.subject.other Spoof surface acoustic waves
dc.subject.other Topological corner states
dc.title Deep-subwavelength holey acoustic second-order topological insulators
dc.type article
dc.identifier.doi https://doi.org/10.1002/adma.201904682
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 49, 1904682
dc.identifier.publicationlastpage 7
dc.identifier.publicationtitle ADVANCED MATERIALS
dc.identifier.publicationvolume 31
dc.identifier.uxxi AR/0000024369
dc.contributor.funder European Commission
dc.contributor.funder Ministerio de Economía y Competitividad (España)
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