title: Structural heterogeneities at the origin of acoustic and transport anomalies in glycerol glass-former.
abstract: By means of large scale molecular dynamics simulations, we explore mesoscopic properties of prototypical glycerol glass-former above and below the glass transition. The model used, in excellent agreement with various experimental techniques, permits to carefully study the structure and the vibrational dynamics. We find that a medium range order is present in glycerol glass-former and arises from hydrogen bond network extension. The characteristic size of the structural heterogeneities is related to the anomalous properties of acoustic vibrations (Rayleigh scattering, "mode softening," and Boson Peak) in the glassy state. Finally the characteristic size of these heterogeneities, nearly constant in temperature, is also connected to the cross-over between structural relaxation and diffusion in liquid glycerol.
authors: Institut des Molécules et Matériaux du Mans UMR-CNRS 6283, Université du Maine, Le Mans, France.
authors: Rémi
authors: R
authors: Busselez
authors: Institut des Molécules et Matériaux du Mans UMR-CNRS 6283, Université du Maine, Le Mans, France.
authors: Thomas
authors: T
authors: Pezeril
authors: Laboratoire d'Acoustique de l'Université du Maine, UMR-CNRS 6613 Université du Maine, Le Mans, France.
authors: Vitalyi E
authors: VE
authors: Gusev