Energetic topography eects on the collective motion of interacting adsorbed particles

RODRIGUEZ, M.; PASINETTI P. M.; BULNES F.; RAMIREZ PASTOR A. J.

La Plata- Buenos Aires

Congreso; 11º Congreso Regional de Física Estadística y Aplicaciones a la Materia Condensada (TREFEMAC 2013); 2013

CCT Conicet La Plata

Collective diffusion of particles with repulsive nearest-neighbor interactions on bivariate surfaces is studied through Monte Carlo simulation, in the framework of the Green-Kubo theory. Weak and strong adsorbing sites form l x l patches distributed at random or in chessboard-like ordered domains on a two- dimensional square lattice. The inuence of the energetic correlation and the lateral interactions on the jump and collective dffusion coefficients is analyzed by simulating the coverage fluctuations in the grand canonical ensemble and the mean-square displacements of particles in the canonical ensemble. The combination topography-lateral couplings is shown to strongly affect the coverage dependence of the transport cofficients.