Quantum-inspired design of a tunable broadband high-Q acoustic resonator

Resonators with a high quality factor (Q) are crucial components in a wide range of advanced technologies, including energy harvesting, chemical and biological sensing, and second-harmonic generation. Many applications also require resonance across a broad frequency range. However, single-cavity resonators face a fundamental trade-off between bandwidth and quality factor. Here we propose an acoustic resonator that overcomes this limitation by drawing inspiration from the ladder of harmonic oscillator states observed in twisted van der Waals heterostructures. By simulating an acoustic analog of twisted bilayer graphene, we discover a tunable ladder of acoustic resonances with Q as high as 4,000. These resonances are separated by as little as 10 Hz and persist over a bandwidth as broad as 1 kHz, forming an effective high-Q, broadband system. Our approach offers a promising pathway to overcome the inherent trade-offs in traditional resonators and paves the way for advanced high-Q acoustic devices.