Vibrational dynamics in amorphous materials

In contrast to crystalline solids, where structural order governs dynamics and thermodynamics, the lack of long-range periodicity in amorphous materials is responsible for several unexpected properties. We combine experimental (inelastic scattering of light, neutrons and X-rays), computational (ab-initio and classical molecular dynamics) and theorethical (field techniques) methods to study anomalies in the dynamics such as non-linear dispersion relation of acoustic excitation, non-quadratic frequency dependence of sound attenuation, non-Debye vibrational density of states. Recent theorethical predictions have been reported in Physical Review Letters , while an experimental determination of the vibrational density of states at the surface of an amorphous material is reported in Nature Communications .

Last Updated ( Thursday, 29 October 2015 )