Abstract. In this paper, interstitial migration generated by scattering with a mobile breather is investigated numerically in a Frenkel-Kontorova onedimensional lattice. Consistent with experimental results, it is shown that interstitial diffusion is more likely and faster than vacancy diffusion. Our simulations support the hypothesis that a long-range energy transport mechanism involving moving nonlinear vibrational excitations may significantly enhance the mobility of point defects in a crystal lattice. 1. Introduction. The Frenkel-Kontorova (FK) model, introduced almost 70 years ago , is one of the most paradigmatic nonlinear systems, whose dynamics has been widely studied during the last decades (see [8, 9, 15, 22] and references therein). From the point of view of condensed matter physics, its paramount importance relies on the ability to describe a vast number of phenomena, including different kind
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