两相无序介质中的软模和类Anderson局域化
Soft-mode and Anderson-like localization in two-phase disordered media
摘要：
波局域化在无序介质中是普遍存在的--从非晶材料（其中软模局域化与材料失效密切相关）到半导体（其中安德森局域化导致金属-绝缘体转变）。然而，我们的主要理解是基于离散模型。在这里，我们提供了一个连续的角度来看，在两相无序弹性介质中的波动局部化，通过研究标量波动方程的非均匀模量和/或密度。在低频率下，软模式出现的结果，无序的弹性模量，这也可以预测的本地化景观。在高频率下，由于密度或模量的无序，会发生类似安德森的局部化。对于后者的情况下，我们演示了如何从平面波的振动动力学的变化，随着频率的增加扩散。最后，我们讨论了我们的研究结果对建筑软材料设计的影响。
英文摘要：
Wave localization is ubiquitous in disordered media -- from amorphous materials, where soft-mode localization is closely related to materials failure, to semi-conductors, where Anderson localization leads to metal-insulator transition. Our main understanding, though, is based on discrete models. Here, we provide a continuum perspective on the wave localization in two-phase disordered elastic media by studying the scalar wave equation with heterogeneous modulus and/or density. At low frequencies, soft modes arise as a result of disordered elastic modulus, which can also be predicted by the localization landscape. At high frequencies, Anderson-like localization occurs due to disorder either in density or modulus. For the latter case, we demonstrate how the vibrational dynamics changes from plane waves to diffusons with increasing frequency. Finally, we discuss the implications of our findings on the design of architected soft materials.
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