Coupling causes chaos: The diffusive dynamics of dimers on periodic surfaces is investigated by numerical simulations. The authors show that the coupling between translational and vibrational degrees of freedom of the dimer can lead to chaotic motion and to non-Arrhenius behavior of thermal diffusion (see picture for a comparison between the adatom and the dimer; l=equilibrium length of the free dimer, a=surface lattice constant).
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Fusco et al. (2005) studied this question.
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