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Observation of roton-like dispersion relations in acoustic metamaterials
- Publication Year :
- 2021
-
Abstract
- Roton dispersion relations, displaying a pronounced “roton” minimum at finite momentum, were firstly predicted by Landau and have been extensively explored in correlated quantum systems at low temperatures. Recently, the roton-like dispersion relations were theoretically extended to classical acoustics, which, however, have remained elusive in reality. Here, we report the experimental observation of roton-like dispersions in acoustic metamaterials with beyond-nearest-neighbour interactions at ambient temperatures. The resulting metamaterial supports multiple coexisting modes with different wavevectors and group velocities at the same frequency and broadband backward waves, analogous to the “return flow” termed by Feynman in the context of rotons. Moreover, by increasing the order of long-range interaction, we observe multiple rotons on a single dispersion band, which have never appeared in Landau’s prediction or any other condensed matter study. The realization of roton-like dispersions in metamaterials could pave the way to explore novel physics and applications on quantum-inspired phenomena in classical systems.
- Subjects :
- Physics
Condensed Matter::Quantum Gases
Condensed Matter::Other
Metamaterial
FOS: Physical sciences
Context (language use)
Applied Physics (physics.app-ph)
Physics - Applied Physics
Roton
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Momentum
symbols.namesake
Dispersion relation
Quantum mechanics
symbols
Feynman diagram
Dispersion (chemistry)
Quantum
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....72d2468739cfd1bf41cad17c331a7a3c