Immunity to Backscattering of Bulk Waves in Topological Acoustic Superlattices

P. A. Deymier, Jérome O. Vasseur, K. Runge, A. Khanikaev, A. Alù

Research output: Contribution to journalArticlepeer-review

Abstract

We herein investigate the scattering of orthogonal counterpropagating waves and one-way propagating bulk waves in discrete acoustic superlattices subjected to a scattering potential applied to one of the superlattice unit cells. We demonstrate theoretically that the orthogonality of counterpropagating modes does not provide robust protection against backscattering. By contrast, the one-way propagating modes do satisfy a no-reflection condition, i.e., they exhibit immunity to backscattering, for a wide range of applied scattering potentials, which represent defects and disorder.

Original languageEnglish (US)
Article number344
JournalCrystals
Volume14
Issue number4
DOIs
StatePublished - Apr 2024

Keywords

  • immunity to scattering
  • phononic superlattice
  • pseudospin
  • topological acoustics

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Materials Science
  • Condensed Matter Physics
  • Inorganic Chemistry

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