Molecular dynamics study of vacancy like defects in a model glass : dynamical behaviour and diffusion

We have shown in the companion paper II, referred to as D-LI hereafter, that it was possible to introduce in a glass of Lennard-Jones particles, which is to be understood as a plausible model for metallic glasses, point defects that have all the characteristics of vacancies in a crystal. These defects can be introduced in the glass by removing an atom, they can jump over one or several interatomic distances and finally the defects can be annihilated by complex collective displacements once they have arrived on specific sites. In the first part of this work, we studied the static properties of the vacancy like defects : in the present one we shall describe their dynamics at