Abstract
We use kinetic Monte Carlo simulations to understand growth-induced and etching-induced step bunching of vicinal surfaces oriented toward and . By taking account of the different rates of surface diffusion on three inequivalent terraces, we reproduce the experimentally observed tendency for single bilayer height steps to bunch into half unit-cell height steps. By taking account of the different mobilities of steps with different structures, we reproduce the experimentally observed tendency for adjacent pairs of half unit-cell height steps to bunch into full unit-cell height steps. A prediction of our simulations is that growth-induced and etching-induced step bunching lead to different surface terminations for the exposed terraces when full unit-cell height steps are present.
5 More- Received 10 March 2009
DOI:https://doi.org/10.1103/PhysRevB.79.245413
©2009 American Physical Society