Dual Dirac cones in elastic Lieb-like lattice metamaterials

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dc.contributor.author Li, Bing
dc.contributor.author Li, Zheng
dc.contributor.author Christensen, Johan
dc.contributor.author Tan, K. T.
dc.date.accessioned 2020-12-15T16:38:28Z
dc.date.available 2020-12-15T16:38:28Z
dc.date.issued 2019-02-25
dc.identifier.bibliographicCitation Applied Physics Letters, 114(8), 081906, Feb. 2019, 5 pp.
dc.identifier.issn 0003-6951
dc.identifier.issn 1077-3118 (online)
dc.identifier.uri http://hdl.handle.net/10016/31604
dc.description.abstract Double-zero-index properties of electromagnetic and acoustic waveguides have been recently realized based on Dirac/Diraclike cones at the Brillouin zone (BZ) center. However, very limited research has been devoted to double-zero-index structural systems of elastic waveguides, and almost no lattice system has been able to achieve multiple separated Dirac cones generated around different frequencies at the BZ center. Here, we report two separated elastic-wave Dirac-like cones, which are simultaneously achieved around different Dirac points at the BZ center, due to the accidental degeneracy and frequency repulsion effect in a Lieb-like lattice metamaterial. Using the proposed elastic medium, the double-zero-index properties of various elastic wave modes are theoretically analyzed, numerically computed, and experimentally observed at the neighborhood of both Dirac-like points. The performance of near total transmission without the phase change and the ability of wave-front shaping are unambiguously verified by numerical simulation and experimental measurements. Published under license by AIP Publishing.
dc.description.sponsorship K. T. Tan acknowledges the Faculty Start-Up Grant support from The University of Akron. J.C. gratefully acknowledges financial support from the MINECO through a Ramón y Cajal Grant (No. RYC-2015-17156). Z. Li acknowledges financial support from the National Natural Science Foundation of China under Grant No. 11672004.
dc.format.extent 5
dc.language.iso eng
dc.publisher AIP Publishing
dc.rights © 2019 Author(s).
dc.subject.other Refractive-Index
dc.subject.other Realization
dc.subject.other Sound
dc.title Dual Dirac cones in elastic Lieb-like lattice metamaterials
dc.type article
dc.subject.eciencia Física
dc.identifier.doi 10.1063/1.5085782
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. RYC-2015-17156
dc.type.version publishedVersion
dc.identifier.publicationfirstpage 1
dc.identifier.publicationissue 8, 081906
dc.identifier.publicationlastpage 5
dc.identifier.publicationtitle APPLIED PHYSICS LETTERS
dc.identifier.publicationvolume 114
dc.identifier.uxxi AR/0000023349
dc.contributor.funder Ministerio de Economía y Competitividad (España)
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