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Condensed Matter > Disordered Systems and Neural Networks
Title: Microscopic analysis of sound attenuation in low-temperature amorphous solids reveals quantitative importance of non-affine effects
(Submitted on 29 Jul 2021 (v1), last revised 31 Mar 2022 (this version, v2))
Abstract: Sound attenuation in low temperature amorphous solids originates from their disordered structure. However, its detailed mechanism is still being debated. Here we analyze sound attenuation starting directly from the microscopic equations of motion. We derive an exact expression for the zero-temperature sound damping coefficient. We verify that the sound damping coefficients calculated from our expression agree very well with results from independent simulations of sound attenuation. The small wavevector analysis of our expression shows that sound attenuation is primarily determined by the non-affine displacements' contribution to the sound wave propagation coefficient coming from the frequency shell of the sound wave. Our expression involves only quantities that pertain to solids' static configurations. It can be used to evaluate the low temperature sound damping coefficients without directly simulating sound attenuation.
Submission history
From: Grzegorz Szamel [view email][v1] Thu, 29 Jul 2021 18:02:46 GMT (177kb,D)
[v2] Thu, 31 Mar 2022 18:00:15 GMT (237kb,D)
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