Tunable Topological Phononic Crystals

Handle URI:
http://hdl.handle.net/10754/614409
Title:
Tunable Topological Phononic Crystals
Authors:
Chen, Ze-Guo; Wu, Ying ( 0000-0002-7919-1107 )
Abstract:
Topological 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.
KAUST Department:
Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division
Citation:
Tunable Topological Phononic Crystals 2016, 5 (5) Physical Review Applied
Publisher:
American Physical Society (APS)
Journal:
Physical Review Applied
Issue Date:
27-May-2016
DOI:
10.1103/PhysRevApplied.5.054021
Type:
Article
ISSN:
2331-7019
Sponsors:
The 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).
Additional Links:
http://link.aps.org/doi/10.1103/PhysRevApplied.5.054021
Appears in Collections:
Articles

Full metadata record

DC FieldValue Language
dc.contributor.authorChen, Ze-Guoen
dc.contributor.authorWu, Yingen
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 Applieden
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.en
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).en
dc.language.isoenen
dc.publisherAmerican Physical Society (APS)en
dc.relation.urlhttp://link.aps.org/doi/10.1103/PhysRevApplied.5.054021en
dc.rightsArchived with thanks to Physical Review Applieden
dc.titleTunable Topological Phononic Crystalsen
dc.typeArticleen
dc.contributor.departmentComputer, Electrical and Mathematical Science and Engineering (CEMSE) Divisionen
dc.identifier.journalPhysical Review Applieden
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorChen, Ze-Guoen
kaust.authorWu, Yingen
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