The Boson Peak and its Relation with Acoustic Attenuation in Glasses

Abstract

Experimental results on the density of states and on the acoustic modes of glasses in the THz region are compared to the predictions of two categories of models. A recent one, solely based on an elastic instability, does not account for most observations. Good agreement without adjustable parameters is obtained with models including the existence of non-acoustic vibrational modes at THz frequency, providing in many cases a comprehensive picture for a range of glass anomalies.

4 pages, 3 figures, Physical Review Letters in press

References in corpus (3)

• Vibrational instability, two-level systems and Boson peak in glasses
• High Frequency dynamics in metallic glasses
• Hyper-Raman scattering from vitreous boron oxide: coherent enhancement of the boson peak

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• Unifying description of the vibrational anomalies of amorphous materials
• Correlation between vibrational anomalies and emergent anharmonicity of local potential energy landscape in metallic glasses
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• Rayleigh anomalies and disorder-induced mixing of polarizations at nanoscale in amorphous solids. Testing 1-octyl-3-methylimidazolium chloride glass
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