Phonon transport and vibrational excitations in amorphous solids

TL;DR

This study clarifies phonon transport mechanisms in amorphous solids, confirming Rayleigh scattering at high frequencies and viscous damping at lower frequencies, and establishes the crossover point using vibrational eigenmode analysis.

Contribution

The paper provides definitive evidence for the crossover from Rayleigh scattering to viscous damping in amorphous solids based on vibrational eigenmodes, resolving longstanding controversies.

Findings

Rayleigh scattering occurs in the continuum limit

Viscous damping occurs in the boson peak regime

Crossover frequency is precisely determined

Abstract

One of the long-standing issues concerning the thermal properties of amorphous solids is the complex pattern of phonon transport. Recent advances in experiments and computer simulations have indicated a crossover from Rayleigh scattering to viscous damping. A number of theories have been proposed, yet critical tests are missing and the validity of these theories is unclear. In particular, the precise location of the crossover frequency remains controversial, and more critically, even the validity of the Rayleigh scattering itself has been seriously questioned. The present work settles these issues by using information on the underlying vibrational eigenmodes. Vibrational eigenmodes were recently clarified over a wide frequency regime: a mixture of phonon modes and soft localized modes in the continuum limit and disordered and extended modes in the boson peak regime. Here, we demonstrate that Rayleigh scattering occurs in the continuum limit and viscous damping occurs in the boson peak regime, and these behaviors are therefore linked to the underlying eigenmodes in the corresponding frequency regimes. Our results unambiguously determine the crossover frequency. Furthermore, we establish characteristic scaling laws of phonon transport, which are consistent with the prediction of the mean-field theory at higher frequencies but inconsistent in the low-frequency, Rayleigh scattering regime. Our results therefore reveal crucial issues to be solved with regard to the current theory.