Observation of zone folding induced acoustic topological insulators and the role of spin-mixing defects

Yuanchen Deng, Hao Ge, Yuan Tian, Minghui Lu, Yun Jing

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70 Scopus citations

Abstract

This article reports on the experimental realization of a flow-free, pseudospin-based acoustic topological insulator designed using the strategy of zone folding. Robust sound one-way propagation is demonstrated with the presence of non-spin-mixing defects. On the other hand, it is shown that spin-mixing defects, which break the geometric symmetry and therefore the pseudo-time-reversal symmetry, can open up nontrivial band gaps within the edge state frequency band, and their width can be tailored by the extent of the defect. This provides a possible route for realizing tunable acoustic topological insulators.

Original languageEnglish (US)
Article number184305
JournalPhysical Review B
Volume96
Issue number18
DOIs
StatePublished - Nov 27 2017

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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