Sound damping in glasses: interplay between anharmonicities and elastic heterogeneities

Abstract

Some facets of the way sound waves travel through glasses are still unclear. Recent works have shown that in the low-temperature harmonic limit a crucial role in controlling sound damping is played by local elastic heterogeneity. Sound waves propagation has been demonstrated to be strongly affected by inhomogeneous mechanical features of the materials, which add to the anharmonic couplings at finite temperatures. We describe the interplay between these two effects by molecular dynamics simulation of a model glass. In particular, we focus on the transverse components of the vibrational excitations in terms of dynamic structure factors, and characterize the temperature dependence of sound attenuation rates in an extended frequency range. We provide a complete picture of all phenomena, in terms encompassing both theory and experiments.

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• Mechanical disorder of sticky-sphere glasses. I. Effect of attractive interactions
• Unifying description of the vibrational anomalies of amorphous materials
• Sound damping in frictionless granular materials: The interplay between configurational disorder and inelasticity
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• Unified study of viscoelasticity and sound damping in hard and soft amorphous solids
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• Structural Origin of Boson Peak in Glasses