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arXiv · 2310.11832

Quartic scaling of sound attenuation with frequency in vitreous silica

P. -J. Wang·A. Huynh·T. -C. Hung·J. -K. Sheu·X. Lafosse·A. Lemaitre·B. Perrin·B. Rufflé·R. Vacher·C. -K. Sun·M. Foret
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Abstract

Many theories predict a quartic acoustic attenuation increase at sub-THz frequencies in glassy media for the excess vibrational modes known as the boson peak anomaly. Here by introducing phase-sensitive acoustic spectroscopy techniques with a THz bandwidth, we investigate the acoustic properties of vitreous silica at 15 and 300K in the crucial but unexplored sub-THz gap region below the boson peak. Our results indicate a strong negative dispersion starting at \SI{500}{GHz} and the onset of an athermal quartic-frequency-scaling acoustic attenuation term, which emerges above all other thermal losses.

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P. -J. Wang, A. Huynh, T. -C. Hung, J. -K. Sheu, X. Lafosse, A. Lemaitre, B. Perrin, B. Rufflé, R. Vacher, C. -K. Sun, M. Foret. 2023-10-18. Quartic scaling of sound attenuation with frequency in vitreous silica. https://arxiv.org/abs/2310.11832

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