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Behavior of the mixture of particles and dimers moving with different jumprates at reconstructed surfaces is described. Collective diffusion coefficientis calculated by the variational approach. Anisotropy of the collectiveparticle motion is analyzed as a function of jump rates and local particledensity. Analytic expressions are compared with the results of Monte Carlosimulations of diffusing particle and dimer mixture. Direction of drivendiffusive motion of the same system depends on the jump anisotropy and on thevalue of driving force. Driven motion results in the particle and dimerseparation when the directions of their easy diffusion axes differ. It is shownthat in such case trapping sites concentrated at some surface areas act asfilters or barriers for particle and dimer mixtures.

Diffusive motion of particles and dimers over anisotropic lattices