  It was recently shown that different simple models of glass formers with
binary interactions define a universality class in terms of the density of
states of their quasi-localized low-frequency modes. Explicitly, once the
hybridization with standard Debye (extended) modes is avoided, a number of such
models exhibit a universal density of state, depending on the mode frequencies
as $D(\omega) \sim \omega^4$. It is unknown however how wide is this
universality class, and whether it also pertains to more realistic models of
glass formers. To address this issue we present analysis of the quasi-localized
modes in silica, a network glass which has both binary and ternary
interactions. We conclude that in 3-dimensions silica exhibits the very same
frequency dependence at low frequencies, suggesting that this universal form is
a generic consequence of amorphous glassiness.

Soft Condensed Matter;Disordered Systems and Neural Networks;Materials Science