Space-time Variant Self-growing Bandgap in Nonlinear Acoustic Metamaterial

  title={Space-time Variant Self-growing Bandgap in Nonlinear Acoustic Metamaterial},
  author={Xin Fang and Jihong Wen and Dianlong Yu},
  journal={arXiv: Applied Physics},
Material band structure is key foundation for various modern technologies, but it was regarded as a space-time invariant feature. Acoustic metamaterials show extraordinary properties for processing elastic waves, but conventional realizations suffer from narrow bandgaps. Here we first report a nonlinear acoustic metamaterial whose band structure self-adapts to the propagation distance/time and the bandgap exhibits a self-growing behaviour stemming from giant nonlinear interaction. This space… 
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