Vibrational states and disorder in continuously compressed model glasses

Abstract

We present in this paper a numerical study of the vibrational eigenvectors of a two-dimensional amorphous material, previously deeply studied from the point of view of mechanical properties and vibrational eigen-frequencies [7-10]. Attention is paid here to the connection between the mechanical properties of this material in term of elastic heterogeneities (EH), and how these inherent heterogeneous structures affect the vibrational eigenvectors and their plane waves decomposition. The systems are analysed for different hydrostatic pressures, and using results from previous studies, a deeper understanding of the boson peak scenario is obtained. The vibrational spectrum of a continuously densified silica glass is also studied, from which it appears that the pulsation associated with the boson peak follows the same pressure dependence trend than that of transverse waves with pulsation associated with the EH characteristic size.

9 pages, 12 figures

References in corpus (11)

• Anharmonicity, vibrational instability and Boson peak in glasses
• Continuum limit of amorphous elastic bodies: A finite-size study of low frequency harmonic vibrations
• Continuum limit of amorphous elastic bodies (III): Three dimensional systems
• Inhomogeneous elastic response of silica glass
• Glass-specific behavior in the damping of acoustic-like vibrations
• The Origin of the Boson Peak and the Thermal Conductivity Plateau in Low Temperature Glasses
• Anomalous properties of the acoustic excitations in glasses on the mesoscopic length-scale
• Vibrations of amorphous, nanometric structures: When does continuum theory apply?
• Observation of the onset of strong scattering on high frequency acoustic phonons in densified silica glass
• Pressure dependence of the Boson peak in glasses
• The crossover from propagating to strongly scattered acoustic modes of glasses observed in densified silica

Cited by in corpus (5)

• Continuum limit of the vibrational properties of amorphous solids
• Structural, vibrational and thermal properties of densified silicates : insights from Molecular Dynamics
• Relation of vibrational excitations and thermal conductivity to elastic heterogeneities in disordered solids
• Temperature-Dependent Defect Dynamics in the Network Glass SiO2
• Universal Scaling in the Aging of the Strong Glass Former SiO${}_2$