Diffusive and subdiffusive step dynamics
Selke, W., Bisani, M.
Institut für Theoretische Physik, Technische Hochschule Aachen,
D-52056 Aachen, Germany
The dynamics of steps on crystal surfaces is considered. In general, the
meandering of the steps obeys a subdiffusive behaviour. The
characteristic time laws depend on the microscopic mechanism
for detachment and attachment of the atoms at the steps. The three
limiting cases of step-edge diffusion, evaporation-condensation and
terrace diffusion are studied in the framework of Langevin
descriptions and by Monte Carlo simulations.