Robust Separation of Topological In-Plane and Out-of-Plane Waves in a Phononic Crystal

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Judicious design of acoustic metamaterials has so far permitted control of topologically-protected waves in one plane of a two-dimensional system. Here, the symmetry of a phononic crystal is tuned geometrically to realise independent tuning of both in-plane and out-of-plane topological modes in the same frequency range. Valley degree of freedom, associated with the valley topological phase, has propelled the advancement of the elastic waveguide by offering immunity to backscattering against bending and weak perturbations. Despite many attempts to manipulate the wave path and working frequency of the waveguide, internal characteristic of an elastic wave such as rich polarization has not yet been utilized with valley topological phases. Here, we introduce the rich polarization into the valley degree of freedom, to achieve topologically protected in-plane and out-of-plane mode separation of an elastic wave. Accidental degeneracy proves its real worth of decoupling the in-plane and out-of-plane polarized valley Hall phases. We further demonstrate independent and simultaneous control of in-plane and out-of-plane waves, with intact topological protection. The presenting procedure for designing the topologically protected wave separation based on accidental degeneracy will widen the valley topological physics in view of both generation mechanism and application areas.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2022-01
Language
English
Article Type
Article
Citation

COMMUNICATIONS PHYSICS, v.5, no.1

ISSN
2399-3650
DOI
10.1038/s42005-021-00793-z
URI
http://hdl.handle.net/10203/292013
Appears in Collection
ME-Journal Papers(저널논문)
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