Dispersion tuning and route reconfiguration of acoustic waves in valley topological phononic crystals

Zhenhua Tian, Chen Shen, Junfei Li, Eric Reit, Hunter Bachman, Joshua E. S. Socolar, Steven A. Cummer () and Tony Jun Huang ()
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Zhenhua Tian: Duke University
Chen Shen: Duke University
Junfei Li: Duke University
Eric Reit: Duke University
Hunter Bachman: Duke University
Joshua E. S. Socolar: Duke University
Steven A. Cummer: Duke University
Tony Jun Huang: Duke University

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract The valley degree of freedom in crystals offers great potential for manipulating classical waves, however, few studies have investigated valley states with complex wavenumbers, valley states in graded systems, or dispersion tuning for valley states. Here, we present tunable valley phononic crystals (PCs) composed of hybrid channel-cavity cells with three tunable parameters. Our PCs support valley states and Dirac cones with complex wavenumbers. They can be configured to form chirped valley PCs in which edge modes are slowed to zero group velocity states, where the energy at different frequencies accumulates at different designated locations. They enable multiple functionalities, including tuning of dispersion relations for valley states, robust routing of surface acoustic waves, and spatial modulation of group velocities. This work may spark future investigations of topological states with complex wavenumbers in other classical systems, further study of topological states in graded materials, and the development of acoustic devices.

Date: 2020
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DOI: 10.1038/s41467-020-14553-0

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