Solitonic-exchange mechanism of surface~diffusion

Details Solitonic-exchange mechanism of surface~diffusion Solitonic-exchange mechanism of surface~diffusion

1996-04-12

arxiv.org/abs/patt-sol/9604002v1

Nonlinear Sciences

Pattern Formation and Solitons

22 Revtex pages, 9 figures to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.54.313

We study surface diffusion in the framework of a generalized Frenkel-Kontorova model with a nonconvex transverse degree of freedom. The model describes a lattice of atoms with a given concentration interacting by Morse-type forces, the lattice being subjected to a two-dimensional substrate potential which is periodic in one direction and nonconvex (Morse) in the transverse direction. The results are used to describe the complicated exchange-mediated diffusion mechanism recently observed in MD simulations [J.E. Black and Zeng-Ju Tian, Phys. Rev. Lett. {\bf 71}, 2445-2448(1993)].

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