Calculations of the velocity and damping of high-frequency sound in solid argon
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Abstract
Numerical calculations of phonon dispersion curves and phonon damping in solid Argon are presented. Particular emphasis is given to the transition between the low-frequency hydrodynamic regime, where collective effects are dominant, and the high-frequency “zero sound” regime, where phonons propagate essentially as single particles. An important quantity in this context is the Peierls' collision operator which is treated through a single relaxation time approximation. The calculations are based on an MLJ (6.12)-potential, and the effects of non-linear dispersion and anisotropy are fully taken into account. This article contains also a summary of the underlying theoretical work which has been presented in more detail in earlier publications.
Keywords
Neural Network Anisotropy Relaxation Time Nonlinear Dynamics Single ParticlePreview
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