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arXiv 1907.03062physics.app-ph
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非线性声学超材料中时空变化的自生长带隙

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

Xin Fang, Jihong Wen, Dianlong Yu

发表信息：
Phys. Rev. B 101, 104304 (2020)
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摘要：

材料的能带结构是各种现代技术的重要基础，但它一直被认为是一种时空不变的特征。声学超材料在处理弹性波方面表现出非凡的性能，但传统的实现方法存在带隙窄的问题。在这里，我们首先报告了一种非线性声学超材料，其能带结构自适应的传播距离/时间和带隙表现出自生长的行为源于巨大的非线性相互作用。这种时空自调制特性突出了对能带结构的非传统理解，并且自生长产生了超低和超宽带隙，突破了线性局部谐振带隙的质量定律的限制。我们还阐明了自适应机制。这第一次演示揭示了设想先进的设备和超材料与宽带，时空变化带隙波自我操纵。

英文摘要：

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-time self-modulating characteristic highlights an unconventional understanding of the band structure, and the self-growth generates an ultralow and ultrabroad bandgap that breaks through the limitation of the mass law for linear locally resonant bandgaps. We also elucidate the self-adaptive mechanisms. This first demonstration sheds light on conceiving advanced devices and metamaterials with broadband, space-time variant bandgaps for wave self-manipulation.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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