2022/11/17 by Luca Iorio, Iorio, Luca, Jacopo Maria De Ponti +5 · 2 citations
Engineering · Physics and Astronomy · #Advanced Fiber Optic Sensors #Classical Physics (physics.class-ph) #FOS: Physical sciences #Mechanical and Optical Resonators #Nonlinear Photonic Systems
paper · pdf · doi:10.48550/arxiv.2211.09431
openalex publication_date 2022/11/17 · openalex created_date 2022/11/26 · openalex updated_date 2026/07/28
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, following the formulation firstly developed by Brillouin in the '50s. 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. Leveraging the intrinsic complexity of elastic systems supporting different types of waves, we demonstrate that mode locking can be applied to obtain roton dispersion, without the need of elastic or magnetic interactions between non nearest neighbors. Moreover, the combination of roton dispersion and rainbow physics enables spatial separation of the energy fluxes with positive and negative group velocity.