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Tunable Dirac cones in two-dimensional acoustic metamaterials with matryoshka structure
Meng Chen1, Wenshuai Xu1, Yu Liu1
1Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
The Journal of the Acoustical Society of America
|August 3, 2019
Summary
Researchers developed tunable acoustic Dirac cones using matryoshka metamaterials. Rotating inner structures enabled frequency tuning and demonstrated topological phase transitions with helical edge states.
Area of Science:
- Acoustics
- Condensed Matter Physics
- Materials Science
Background:
- Dirac cones are crucial for topological phase transitions in acoustic systems.
- Achieving tunable Dirac cones in novel acoustic structures remains a key research challenge.
Purpose of the Study:
- To propose and investigate a two-dimensional acoustic metamaterial with a matryoshka structure for tunable Dirac cones and topological spin states.
- To explore the manipulation of Dirac cone properties and topological transitions via structural modifications.
Main Methods:
- Utilized a matryoshka-inspired acoustic metamaterial with concentric scattering units arranged in honeycomb lattices.
- Employed a rotating-scatterer mechanism to break lattice symmetry and induce topological transitions.
- Analyzed dispersion curves to identify Dirac points, band gaps, and topological properties.
Main Results:
- Successfully realized tunable Dirac cones in the proposed acoustic metamaterial.
- Demonstrated the splitting of Dirac cones and the emergence of topological spin states by rotating scatterers.
- Verified topological transitions with varying Chern numbers and observed helical edge states at interfaces.
Conclusions:
- The matryoshka acoustic metamaterial offers a novel platform for creating tunable Dirac cones and exploring topological phenomena.
- Structural rotation provides an effective method for controlling topological properties and edge states in acoustic systems.
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