Floquet topological insulators for sound

Romain Fleury (), Alexander B Khanikaev () and Andrea Alù ()
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Romain Fleury: The University of Texas at Austin
Alexander B Khanikaev: Queens College of The City University of New York
Andrea Alù: The University of Texas at Austin

Nature Communications, 2016, vol. 7, issue 1, 1-11

Abstract: Abstract The unique conduction properties of condensed matter systems with topological order have recently inspired a quest for the similar effects in classical wave phenomena. Acoustic topological insulators, in particular, hold the promise to revolutionize our ability to control sound, allowing for large isolation in the bulk and broadband one-way transport along their edges, with topological immunity against structural defects and disorder. So far, these fascinating properties have been obtained relying on moving media, which may introduce noise and absorption losses, hindering the practical potential of topological acoustics. Here we overcome these limitations by modulating in time the acoustic properties of a lattice of resonators, introducing the concept of acoustic Floquet topological insulators. We show that acoustic waves provide a fertile ground to apply the anomalous physics of Floquet topological insulators, and demonstrate their relevance for a wide range of acoustic applications, including broadband acoustic isolation and topologically protected, nonreciprocal acoustic emitters.

Date: 2016
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DOI: 10.1038/ncomms11744

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