Broadband tunable acoustic topological metamaterials
Phys. Rev. Applied 25, 034022 – Published 6 March, 2026
DOI: https://doi.org/10.1103/hq66-2y4q
Abstract
This paper presents a multiscale design strategy for acoustic topological metamaterials (ATMs) by leveraging coupled resonances between local resonance units. We achieve synergistic sound energy transmission by utilizing the coupling resonance between local resonant units, while integrating meta-atom models with metamolecule architectures. This methodology enables the realization of both multiband and broadband ATMs with tailored wave manipulation capabilities across different frequency regimes. By adjusting the rotation angle of the structure, the mirror symmetry is broken, and the valley topological phase transition is realized with edge states in two distinct frequency bands, which can be individually tuned by tailoring the structural parameters of corresponding unit cells. Triband ATMs can be realized by integrating three kinds of unit cells, which independently control the edge-state frequencies through geometry parameter adjustments. Based on Fano resonance, by superimposing two independently modulated edge-state bands, a broadband topological metamaterial can be obtained with coupling effects. Both simulated and experimental results indicate that the ATMs present broadband topological transport of edge states. This design provides a paradigm for the regulation of topological quantum states and advances the practical process of low-energy quantum devices.
