Experimental verification of acoustic pseudospin multipoles in a symmetry-broken snowflakelike topological insulator

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dc.contributor.author Zhang, Zhiwang
dc.contributor.author Tian, Ye
dc.contributor.author Cheng, Ying
dc.contributor.author Liu, Xiaojun
dc.contributor.author Christensen, Johan
dc.date.accessioned 2018-02-06T11:14:12Z
dc.date.available 2018-02-06T11:14:12Z
dc.date.issued 2017-12-29
dc.identifier.bibliographicCitation Physical review. B. Condensed matter and materials physics, 96, 241306(R), pp. 1-8, Dec. 2017
dc.identifier.issn 1098-0121
dc.identifier.issn 1538-4489 (online)
dc.identifier.uri http://hdl.handle.net/10016/26197
dc.description.abstract Topologically protected wave engineering in artificially structured media resides at the frontier of ongoing metamaterials research, which is inspired by quantum mechanics. Acoustic analogs of electronic topological insulators have recently led to a wealth of new opportunities in manipulating sound propagation by means of robust edge mode excitations through analogies drawn to exotic quantum states. A variety of artificial acoustic systems hosting topological edge states have been proposed analogous to the quantum Hall effect, topological insulators, and Floquet topological insulators in electronic systems. However, those systems were characterized by a fixed geometry and a very narrow frequency response, which severely hinders the exploration and design of useful applications. Here we establish acoustic multipolar pseudospin states as an engineering degree of freedom in time-reversal invariant flow-free phononic crystals and develop reconfigurable topological insulators through rotation of their meta-atoms and reshaping of the metamolecules. Specifically, we show how rotation forms man-made snowflakelike molecules, whose topological phase mimics pseudospin-down (pseudospin-up) dipolar and quadrupolar states, which are responsible for a plethora of robust edge confined properties and topological controlled refraction disobeying Snell's law.
dc.description.sponsorship This work was supported by National Key R&D Program of China (2017YFA0303702), NSFC (Grants No. 11674172, No. 11574148, No. 11474162), Jiangsu Provincial NSF (BK20160018), and Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX17_0020). 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 8
dc.format.mimetype image/gif
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher American Physical Society
dc.rights © 2017 American Physical Society
dc.subject.other Topological insulators
dc.subject.other Acoustic metamaterials
dc.subject.other Edge states
dc.title Experimental verification of acoustic pseudospin multipoles in a symmetry-broken snowflakelike topological insulator
dc.type article
dc.subject.eciencia Materiales
dc.identifier.doi https://doi.org/10.1103/PhysRevB.96.241306
dc.rights.accessRights openAccess
dc.relation.projectID info:eu-repo/grantAgreement/EC/H2020/714577
dc.relation.projectID Gobierno de España. RYC-2015-17156
dc.type.version publishedVersion
dc.identifier.publicationfirstpage 1
dc.identifier.publicationissue 241306(R)
dc.identifier.publicationlastpage 8
dc.identifier.publicationtitle Physical review. B. Condensed matter and materials physics
dc.identifier.publicationvolume 96
dc.identifier.uxxi AR/0000020796
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