  Several experiments on molecular and metallic glasses have shown that the
ability of vapor deposition to produce ultrastable glasses is correlated with
their structural and thermodynamic properties. Here we investigate the vapor
deposition of a class of tetrahedral materials (including silicon and water)
via molecular dynamics simulations of the generalized Stillinger-Weber
potential. By changing a single parameter that controls the local
tetrahedrality, we show that the emergence of ultrastable behavior is
correlated with an increase in the fragility of the model. At the same time,
while the mobility of the surface compared to the bulk shows only slight
changes at low temperature, with increasing the tetrahedrality, it displays a
significant enhancement towards the glass transition temperature. Our results
point towards a strong connection between bulk dynamics, surface dynamics and
glass-ultrastability ability in this class of materials.
