Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D23: Advances in Probing and Designing Topological Materials: Theory and Experiment
3:00 PM–6:00 PM,
Monday, March 6, 2023
Room: Room 215
Sponsoring
Unit:
DCMP
Chair: Clifford Hicks, University of Birmingham
Abstract: D23.00015 : Simple Coupling Method for Topological Acoustic Metamaterial Measurement
5:48 PM–6:00 PM
Presenter:
Ssu-Ying Chen
(New Jersey Institute of Technology)
Author:
Ssu-Ying Chen
(New Jersey Institute of Technology)
Recent years, acoustic waves have emerged as an excellent platform that exemplify the universality and diversity of topological phases.
Since the properties of topological insulators and their surface states highly depend on the dimension of the material and its symmetries, and can be categorized using the periodic table of topological insulators, it means that some combinations of dimension and symmetries would prevent topological insulation. From the experimental perspective, it is crucial to satisfy certain structures and to display the symmetry, preserving the symmetry is equivalent to preserving the topological properties. Therefore, to preserve symmetry, coupling method has to be carefully chosen. The question then arises: In discrete acoustic resonant models, how to efficiently couple the resonators to form a desired structure and to preserve the symmetry in the mean time, so it complies with the idea of topological meta-material?
Here, we propose an experimentally ingenious implementation to couple the acoustic crystals in topological acoustic system, and demonstrate that our implementation supports topologically protected edge and interface states. The setup is easy to assemble and dissemble as Lego bricks, and is proven to be effective to preserve the topological symmetry.
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