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Abstract
We investigate diffusion of particles adsorbed on a heterogeneous honeycomb lattice withtwo kinds of non-equivalent sites. General analytical expressions for the chemical and jumpdiffusion coefficients have been derived in the case of strong inhomogeneity. It is shown thatthe character of the particle migration depends crucially on the relative jumpfrequencies of particles occupying deep and shallow sites. In the case of widelydiffering jump frequencies, particles perform pairs of strongly correlated jumps.We have calculated coverage dependencies of the diffusion coefficients and somethermodynamic quantities for attractive and repulsive lateral pairwise interactions andcompared them with the results of the kinetic Monte Carlo simulations of the particlediffusion. Almost perfect agreement between the respective results has been found.
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