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dc.contributor.authorChen, Zeguo
dc.contributor.authorWu, Ying
dc.date.accessioned2016-06-23T11:06:30Z
dc.date.available2016-06-23T11:06:30Z
dc.date.issued2016-05-27
dc.identifier.citationTunable Topological Phononic Crystals 2016, 5 (5) Physical Review Applied
dc.identifier.issn2331-7019
dc.identifier.doi10.1103/PhysRevApplied.5.054021
dc.identifier.urihttp://hdl.handle.net/10754/614409
dc.description.abstractTopological insulators first observed in electronic systems have inspired many analogues in photonic and phononic crystals in which remarkable one-way propagation edge states are supported by topologically nontrivial band gaps. Such band gaps can be achieved by breaking the time-reversal symmetry to lift the degeneracy associated with Dirac cones at the corners of the Brillouin zone. Here, we report on our construction of a phononic crystal exhibiting a Dirac-like cone in the Brillouin zone center. We demonstrate that simultaneously breaking the time-reversal symmetry and altering the geometric size of the unit cell result in a topological transition that we verify by the Chern number calculation and edge-mode analysis. We develop a complete model based on the tight binding to uncover the physical mechanisms of the topological transition. Both the model and numerical simulations show that the topology of the band gap is tunable by varying both the velocity field and the geometric size; such tunability may dramatically enrich the design and use of acoustic topological insulators.
dc.description.sponsorshipThe authors would like to thank X. Ni, X. C. Sun, and X. J. Zhang for stimulating discussions. The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).
dc.language.isoen
dc.publisherAmerican Physical Society (APS)
dc.relation.urlhttp://link.aps.org/doi/10.1103/PhysRevApplied.5.054021
dc.rightsArchived with thanks to Physical Review Applied
dc.titleTunable Topological Phononic Crystals
dc.typeArticle
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
dc.contributor.departmentApplied Mathematics and Computational Science Program
dc.identifier.journalPhysical Review Applied
dc.eprint.versionPublisher's Version/PDF
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
dc.identifier.arxividarXiv:1512.00814
kaust.personChen, Zeguo
kaust.personWu, Ying
refterms.dateFOA2018-06-13T17:56:46Z


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