Roton-Like Dispersion via Polarization Change for Elastic Wave Control

While roton dispersion relations had been restricted to correlated quantum systems at low temperature, recent works show the possibility of obtaining this unusual dispersion in acoustic and elastic metamaterials. Such phenomenon has been demonstrated in periodic structures by means of beyond-nearest...

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Bibliographic Details
Main Authors: Iorio, L., De Ponti, J. M., Maspero, F., Ardito, R.
Format: Conference Proceeding
Language:English
Subjects:
Acoustics
Couplings
Elasticity
Energy exchange
Metamaterials
Quantum system
Waveguide transitions
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Summary:While roton dispersion relations had been restricted to correlated quantum systems at low temperature, recent works show the possibility of obtaining this unusual dispersion in acoustic and elastic metamaterials. Such phenomenon has been demonstrated in periodic structures by means of beyond-nearest-neighbor interactions. In this paper, we demonstrate both numerically and experimentally that beyond-nearest-neighbor connections are not a necessary condition to obtain this unusual dispersion relation in elasticity. Moreover, we show that the combination of roton dispersion and rainbow physics enables spatial separation of the energy fluxes with positive and negative group velocity.
ISSN:2573-2706
DOI:10.1109/Metamaterials58257.2023.10289504