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 formation of three-dimensional structures such as mounds or pyramids. The characteristic size R of these structures increases as a function of deposition time with a power law $R\ensuremath{\sim}{t}^{n}$. In order to investigate the dependence of the growth exponent n on the characteristics of the fluctuations of the deposition flux we compare results of Monte-Carlo simulations for random deposition and for deposition on an artificially constructed deterministic sequence of sites. Although the latter algorithm leads to much smaller height fluctuations on each site, the growth exponent in both cases is found to be close to 0.25.