Height–height correlations for surface growth on percolation networks

The height–height correlations of the surface growth for equilibrium and nonequilibrium restricted solid-on-solid (RSOS) model were investigated on randomly diluted lattices, i.e., on infinite percolation networks. It was found that the correlation function calculated over the chemical distances reflected the dynamics better than that calculated over the geometrical distances. For the equilibrium growth on a critical percolation network, the correlation function for the evolution time t≫1t≫1 yielded a power-law behavior with the power ζ′ζ′, associated with the roughness exponent ζζ via the relation ζ=ζ′df/dlζ=ζ′df/dl, with dfdf and dldl being, respectively, the fractal dimension and the chemical dimension of the substrate. For the nonequilibrium growth, on the other hand, the correlation functions did not yield power-law behaviors for the concentration of diluted sites xx less than or equal to the critical concentration xcxc.