Experimental observation of roton-like dispersion relations in metamaterials.

ABSTRACT: Previously, rotons were observed in correlated quantum systems at low temperatures, including superfluid helium and Bose-Einstein condensates. Here, following a recent theoretical proposal, we report the direct experimental observation of roton-like dispersion relations in two different three-dimensional metamaterials under ambient conditions. One experiment uses transverse elastic waves in microscale metamaterials at ultrasound frequencies. The other experiment uses longitudinal air-pressure waves in macroscopic channel–based metamaterials at audible frequencies. In both experiments, we identify the roton-like minimum in the dispersion relation that is associated to a triplet of waves at a given frequency. Our work shows that designed interactions in metamaterials beyond the nearest neigh

SUBMITTER: Iglesias Martinez JA 

PROVIDER: S-EPMC8635434 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature