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

Article

关键词: EDGE STATES;   

DOI  :  10.1103/PhysRevB.96.184305

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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