The present review article discusses the nature and properties of soft atomic motion modes,
and their role in anomalous properties, including low-energy dynamical properties, of …

The inelastic scattering intensities of glasses and amorphous materials have a maximum at
a low frequency, the so-called boson peak. Under applied hydrostatic pressure P, the boson …

A numerical simulation study of the density dependence (ρ= 2.2–4.0 g cm− 3) of the high
energy collective dynamics in vitreous silica at mesoscopic wavevectors (Q= 1–18 nm− 1) is …

The vibrational density of states (VDOS) of disordered systems shows a low-frequency
excess, the so-called boson peak. Experiments show a change in the shape of the boson …

The pressure dependence of the boson peak in glasses within the framework of the
extended soft potential model is reconsidered, taking effects at small pressures into account …

We study numerically the disorder-induced localization–delocalization phase transitions that
occur for mass and spring constant disorder in a three-dimensional cubic lattice with …

In the present article, glasses are considered, for which THz frequency vibrational anomalies
include both an experimentally observed boson peak and, above it, a “high-frequency” …

Adding GeO 2 to optical fiber quality silica glass produces additional mass, dipole moment,
and polarizability variability. There is a factor 2.5 increase in Raman scattering for both the …

Why should one care about a bit of rattling in disordered materials? On the face of it, the
states addressed in this monograph only amount to a few 10s ppm of the total number of …

We use a transfer-matrix method to study the localization properties of vibrations in a'mass
and spring'model with simple cubic lattice structure. Disorder is applied as a box-distribution …