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Temporal super-cell engineering and acoustic amplification in dispersive phononic time crystals
Ziling Liu1, Xinghong Zhu2,3, Zhi-Guo Zhang1
1School of Mechanics and Photoelectric Physics, Center for Fundamental Physics, Anhui University of Science and Technology, Huainan, 232001, China.
Nature Communications
|June 2, 2026
Summary
Researchers created a phononic time crystal using acoustic waveguides. This novel metamaterial platform enables enhanced wave control and opens multiple momentum band gaps (k-gaps) through a temporal-supercell concept.
Area of Science:
- Acoustic metamaterials
- Condensed matter physics
- Nonlinear optics
Background:
- Floquet time crystals exhibit momentum band gaps (k-gaps) crucial for advanced wave control.
- Experimental challenges exist in precisely controlling Floquet band structures and creating multiple k-gaps.
Purpose of the Study:
- To construct a phononic time crystal platform for enhanced wave control.
- To explore the creation of multiple k-gaps using a temporal-supercell concept.
Main Methods:
- Integration of resonant meta-atoms into a 1D acoustic waveguide.
- Dynamic compressibility modulation of the metamaterial.
- Introduction of a temporal-supercell concept for band folding.
Main Results:
- Observed amplified transmission and emission enhancement in a compact Floquet slab.
- Demonstrated two amplified transmission ranges using the temporal-supercell concept, corresponding to multiple k-gaps.
- Verified band-folding-induced k-gaps through compressibility design.
Conclusions:
- The developed phononic time crystal is a reconfigurable platform for tailored parametric processes.
- This work unlocks new pathways toward higher-dimensional time crystals and topological temporal phenomena.
