All simulations were performed in a cubic system with a 30a0 30a0 30a0 computational cell for which the equilibrium
cubic lattice constant a0 was set to 0.28553 nm with periodic boundary conditions. A single SIA was introduced in the form
of a stable 110 dumbbell. The system was first equilibrate for 0.1 ns at the desired temperature using Langevin MD with a time step of 0.50–1.0 fs, depending on the temperature. All physical properties were statistically averaged over the following 1 ns. The diffusivity, D, was evaluated from the asymptotic behavior of the mean square displacement of the diffusing
SIA.