Sentetik akustik maddede geniş bant iletim ve genlik güdümlü topolojik sınırlamanın bir arada bulunması

Özet (abstract)

Nonlinear and topological wave phenomena offer new opportunities for robust wave manipulation. Existing experimental platforms have largely focused on on-site (Kerr-like) nonlinearities within tight-binding frameworks, leaving the regime of programmable nonlinear inter-site coupling in far-field scattering systems essentially unexplored. Here we demonstrate a programmable acoustic metamaterial that exhibits amplitude-driven topological confinement of sound while simultaneously maintaining broadband linear transmission across the same frequency range. The system consists of an open acoustic waveguide coupled to a chain of actively controlled electroacoustic resonators enabling tunable nonlinear and nonlocal interactions. Using a classical wave-scattering model we show that increasing the excitation amplitude drives a robust topological interface mode localized deep within the structure, with the confinement strengthening continuously with drive rather than at a finite threshold. The predictions are verified experimentally using a fully programmable metacrystal composed of individually controlled acoustic resonators, enabling real-time manipulation of coupling parameters. The mode's topological origin is established by symmetry: it survives coupling disorder beyond 50% of nominal but collapses when a delay between adjacent couplings is introduced, effectively breaking the protecting chiral symmetry. These results establish a versatile platform for studying nonlinear topological wave physics and for designing adaptive acoustic metamaterials.

Yazarların özeti; kaynağından alınmıştır. Physical Review Applied, 2026 · DOI ↗