Abstract
Neutron scattering studies in a wide range of energy-momentum space of vitreous silica have revealed for the first time that an acoustic phonon dispersion in quasi-Brillouin zones coexists with a localized mode, so-called the Boson peak, which penetrates through the dispersion in the low-energy region. The coexistence of these modes is likely an origin of the peculiar thermal properties of glassy system.
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