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In this paper, interstitial migration generated by scattering with a mobilebreather is investigated numerically in a Frenkel-Kontorova one-dimensionallattice. Consistent with experimental results it is shown that interstitialdiffusion is more likely and faster than vacancy diffusion. Our simulationssupport the hypothesis that a long-range energy transport mechanism involvingmoving nonlinear vibrational excitations may significantly enhance the mobilityof point defects in a crystal lattice.

Interaction of moving discrete breathers with interstitial defects