Abstract
We report the experimental realization of an acoustic Chern insulator (ACI), by using an angular-momentum-biased resonator array with the broken Lorentz reciprocity. High -factor resonance of the constituent rotors is leveraged to reduce the required rotation speed. ACI is a new topological acoustic system analogous to the electronic quantum Hall insulator, based on an effective magnetic field. Experimental results show that the ACI featured with a stable and uniform metafluid flow bias supports one-way nonreciprocal transport of sound at its edges, which is topologically immune to various types of defects. Our work opens up opportunities for exploring unique observable topological phases and developing topological-insulator-based nonreciprocal devices in acoustics.
- Received 23 August 2017
DOI:https://doi.org/10.1103/PhysRevLett.122.014302
© 2019 American Physical Society
Physics Subject Headings (PhySH)
Synopsis
One-Way Sound Transport
Published 9 January 2019
An array of air channels behaves as an “acoustic Chern insulator” in which sound waves travel only around the edges and only in one direction.
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