Locally frozen defects in random sequential adsorption with diffusional relaxation

Random sequential adsorption with diffusional relaxation, of two by two square objects on the two-dimensional square lattice, is studied by Monte Carlo computer simulation. Asymptotically for large lattice sizes, diffusional relaxation allows the deposition process to reach full coverage. The coverage approaches the full occupation value, 1, as a power-law with convergence exponent near 12. For a periodic lattice of finite (even) size L, the final state is a frozen random rectangular grid of domain walls connecting single-site defects. The domain sizes saturate at ∼L0.8. Prior to saturation, i.e., asymptotically for infinite lattice, the domain growth is power-law with growth exponent near, or possibly somewhat smaller than, 12.