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Observation of Chirality‐Induced Roton‐Like Dispersion in a 3D Micropolar Elastic Metamaterial

Chen, Yi 1,2; Schneider, Jonathan L. G. 1; Groß, Michael F. ORCID iD icon 1,2; Wang, Ke 1; Kalt, Sebastian 1; Scott, Philip 1; Kadic, Muamer; 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)


A theoretical paper based on chiral micropolar effective-medium theory suggested the possibility of unusual roton-like acoustical-phonon dispersion relations in 3D elastic materials. Here, as a first novelty, the corresponding inverse problem is solved, that is, a specific 3D chiral elastic metamaterial structure is designed, the behavior of which follows this effective-medium description. The metamaterial structure is based on a simple-cubic lattice of cubes, each of which not only has three translational but also three rotational degrees of freedom. The additional rotational degrees of freedom are crucial within micropolar elasticity. The cubes and their degrees of freedom are coupled by a chiral network of slender rods. As a second novelty, this complex metamaterial is manufactured in polymer form by 3D laser printing and its behavior is characterized experimentally by phonon-band-structure measurements. The results of these measurements, microstructure finite-element calculations, and solutions of micropolar effective-medium theory are in good agreement. The roton-like dispersion behavior of the lowest phonon branch results from two aspects. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000160252
Veröffentlicht am 07.07.2023
DOI: 10.1002/adfm.202302699
Zitationen: 2
Web of Science
Zitationen: 2
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Physik (APH)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2024
Sprache Englisch
Identifikator ISSN: 1616-301X, 1616-3028
KITopen-ID: 1000160252
HGF-Programm 43.32.02 (POF IV, LK 01) Designed Optical Materials
Erschienen in Advanced Functional Materials
Verlag Wiley-VCH Verlag
Band 34
Heft 20
Seiten Art.Nr. 2302699
Vorab online veröffentlicht am 06.06.2023
Nachgewiesen in Dimensions
Web of Science
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