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Roton-like acoustical dispersion relations in 3D metamaterials

Chen, Yi 1; Kadic, Muamer 2; Wegener, Martin 1,2
1 Institut für Angewandte Physik (APH), Karlsruher Institut für Technologie (KIT)
2 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)


Roton dispersion relations have been restricted to correlated quantum systems at low temperatures, such as liquid Helium-4, thin films of Helium-3, and Bose–Einstein condensates. This unusual kind of dispersion relation provides broadband acoustical backward waves, connected to energy flow vortices due to a “return flow”, in the words of Feynman, and three different coexisting acoustical modes with the same polarization at one frequency. By building mechanisms into the unit cells of artificial materials, metamaterials allow for molding the flow of waves. So far, researchers have exploited mechanisms based on various types of local resonances, Bragg resonances, spatial and temporal symmetry breaking, topology, and nonlinearities. Here, we introduce beyond-nearest-neighbor interactions as a mechanism in elastic and airborne acoustical metamaterials. For a third-nearest-neighbor interaction that is sufficiently strong compared to the nearest-neighbor interaction, this mechanism allows us to engineer roton-like acoustical dispersion relations under ambient conditions.

Verlagsausgabe §
DOI: 10.5445/IR/1000133967
Veröffentlicht am 17.06.2021
DOI: 10.1038/s41467-021-23574-2
Zitationen: 8
Web of Science
Zitationen: 5
Zitationen: 12
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Physik (APH)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000133967
HGF-Programm 43.32.02 (POF IV, LK 01) Designed Optical Materials
Erschienen in Nature Communications
Verlag Nature Research
Band 12
Heft 1
Seiten Art.-Nr.: 3278
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Nachgewiesen in Web of Science
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