Pyramid growth without deposition noise

Several models of molecular-beam epitaxy, both atomistic and ones based on Langevin equations, have as one of their generic growth scenarios the forma tion of three-dimensional structures such as mounds or pyramids. The charac teristic size R of these structures increases as a function of deposition t ime with a power law R similar to t(n). In order to investigate the depende nce of the growth exponent n on the characteristics of the fluctuations of the deposition flux we compare results of Monte-Carlo simulations for rando m deposition and for deposition on an artificially constructed deterministi c sequence of sites. Although the latter algorithm leads to much smaller he ight fluctuations on each site, the growth exponent in both cases is found to be dose to 0.25.