The Atomic Slide Puzzle: Self-Diffusion of an Impure Atom

Details The Atomic Slide Puzzle: Self-Diffusion of an Impure Atom The Atomic Slide Puzzle: Self-Diffusion of an Impure Atom

2001-06-08

arxiv.org/abs/cond-mat/0106150v1

Physics

Condensed Matter

Statistical Mechanics

Latex, 4 pages, 2 figures, to appear in Phys. Rev. E (RC)

Scientific paper

10.1103/PhysRevE.64.020103

In a series of recent papers van Gastel et al have presented first experimental evidence that impure, Indium atoms, embedded into the first layer of a Cu(001) surface, are not localized within the close-packed surface layers but make concerted, long excursions visualized in a series of STM images. Such excursions occur due to continuous reshuffling of the surface following the position exchanges of both impure and host atoms with the naturally occuring surface vacancies. Van Gastel et al have also formulated an original lattice-gas type model with asymmetric exchange probabilities, whose numerical solution is in a good agreement with the experimental data. In this paper we propose an exact lattice solution of several versions of this model.

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