Corner states in a second-order mechanical topological insulator

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dc.contributor.author Chen, Chun Wei
dc.contributor.author Chaunsali, Rajesh
dc.contributor.author Christensen, Johan
dc.contributor.author Theocharis, Georgios
dc.contributor.author Yang, Jinkyu
dc.date.accessioned 2022-05-05T09:40:03Z
dc.date.available 2022-05-05T09:40:03Z
dc.date.issued 2021-06-11
dc.identifier.bibliographicCitation Chen, C.-W., Chaunsali, R., Christensen, J., Theocharis, G., & Yang, J. (2021). Corner states in a second-order mechanical topological insulator. In Communications Materials (Vol. 2, Issue 1). Springer Science and Business Media LLC.
dc.identifier.issn 2662-4443
dc.identifier.uri http://hdl.handle.net/10016/34701
dc.description.abstract Demonstration of topological boundary modes in elastic systems has attracted a great deal of attention over the past few years due to its unique protection characteristic. Recently, second-order topological insulators have been proposed in manipulating the topologically protected localized states emerging only at corners. Here, we numerically and experimentally study corner states in a two-dimensional phononic crystal, namely a continuous elastic plate with embedded bolts in a hexagonal pattern. We create interfacial corners by adjoining trivial and non-trivial topological configurations. Due to the rich interaction between the bolts and the continuous elastic plate, we find a variety of corner states of and devoid of topological origin. Strikingly, some of the corner states are not only highly-localized but also tunable. Taking advantage of this property, we experimentally demonstrate asymmetric corner localization in a Z-shaped domain wall. This finding could create interest in exploration of tunable corner states for the use of advanced control of wave localization.
dc.description.sponsorship C.-W.C. and J.Y. are grateful for the support from NSF (CAREER1553202 and EFRI- 1741685). R.C. and G.T. acknowledge support by the project CS.MICRO funded under the program Etoiles Montantes of the Region Pays de la Loire. 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 6
dc.language.iso eng
dc.publisher Springer Science and Business Media LLC
dc.rights © The Author(s) 2021
dc.rights Atribución 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by/3.0/es/
dc.title Corner states in a second-order mechanical topological insulator
dc.type article
dc.subject.eciencia Aeronáutica
dc.subject.eciencia Física
dc.identifier.doi https://doi.org/10.1038/s43246-021-00170-x
dc.rights.accessRights openAccess
dc.relation.projectID Internacional. 714577
dc.relation.projectID Gobierno de España. RYC-2015-17156
dc.type.version publishedVersion
dc.identifier.publicationfirstpage 1
dc.identifier.publicationissue 62
dc.identifier.publicationlastpage 6
dc.identifier.publicationtitle Communications Materials
dc.identifier.publicationvolume 2
dc.identifier.uxxi AR/0000030507
dc.contributor.funder European Commission
dc.contributor.funder Ministerio de Economía y Competitividad (España)
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