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Topological mechanics of gyroscopic metamaterials

Nash, Lisa M. ; Kleckner, Dustin ; Read, Alismari ; Vitelli, Vincenzo ; Turner, Ari M. ; Irvine, William T. M.

Proceedings of the National Academy of Sciences - PNAS, 2015-11, Vol.112 (47), p.14495-14500 [Periódico revisado por pares]

United States: National Academy of Sciences

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  • Título:
    Topological mechanics of gyroscopic metamaterials
  • Autor: Nash, Lisa M. ; Kleckner, Dustin ; Read, Alismari ; Vitelli, Vincenzo ; Turner, Ari M. ; Irvine, William T. M.
  • Assuntos: Acoustics ; Gyroscopes ; Lattice theory ; Mathematical models ; Physical Sciences ; Symmetry ; Topology
  • É parte de: Proceedings of the National Academy of Sciences - PNAS, 2015-11, Vol.112 (47), p.14495-14500
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    Edited by David A. Weitz, Harvard University, Cambridge, MA, and approved October 13, 2015 (received for review April 17, 2015)
    Author contributions: L.M.N., D.K., V.V., A.M.T., and W.T.M.I. designed research; L.M.N., D.K., A.R., A.M.T., and W.T.M.I. performed research; L.M.N., D.K., A.R., A.M.T., and W.T.M.I. analyzed data; and L.M.N., D.K., V.V., A.M.T., and W.T.M.I. wrote the paper.
  • Descrição: Topological mechanical metamaterials are artificial structures whose unusual properties are protected very much like their electronic and optical counterparts. Here, we present an experimental and theoretical study of an active metamaterial—composed of coupled gyroscopes on a lattice—that breaks time-reversal symmetry. The vibrational spectrum displays a sonic gap populated by topologically protected edge modes that propagate in only one direction and are unaffected by disorder. We present a mathematical model that explains how the edge mode chirality can be switched via controlled distortions of the underlying lattice. This effect allows the direction of the edge current to be determined on demand. We demonstrate this functionality in experiment and envision applications of these edge modes to the design of oneway acoustic waveguides.
  • Editor: United States: National Academy of Sciences
  • Idioma: Inglês
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