Experimental observation of roton-like dispersion relations in metamaterials

2021/12/01 by Julio Andrés Iglesias Martínez, Michael Fidelis Groß, Yi Chen +4 · 1 voice · 8 citations
Engineering · Physics and Astronomy · #Acoustic Wave Phenomena Research #Aerodynamics and Acoustics in Jet Flows #Quantum, superfluid, helium dynamics

paper · doi:10.1126/sciadv.abm2189

openalex publication_date 2021/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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 neighbors open unprecedented experimental opportunities to tailor the lowest dispersion branch—while most previous metamaterial studies have concentrated on shaping higher dispersion branches.

Citations

• Theory of the Superfluidity of Helium II
• Optimal lens design and use in laser-scanning microscopy
• Roton-like acoustical dispersion relations in 3D metamaterials

Cited by

• Discrete Euler–Bernoulli beam lattices with beyond nearest connections
• Anomalous frozen evanescent phonons
• Mechanical metamaterials
• Dispersion Engineering by Hybridizing the Back‐Folded Soft Mode of Monomode Elastic Metamaterials with Stiff Acoustic Modes
• Cubic-symmetry acoustic metamaterials with roton-like dispersion relations
• Observation of Chirality‐Induced Roton‐Like Dispersion in a 3D Micropolar Elastic Metamaterial
• Tetramode Metamaterials as Phonon Polarizers
• Phonon transmission through a nonlocal metamaterial slab

Discussions

• In a paper published in Science Advances, Cluster researchers report the direct experimental observation of roton-like dispersion relations in two different 3D metamaterials under ambient conditions. [bsky, 0 points, 0 comments]