Abstract
The kinetics of monoatomic steps in diffusion-controlled crystal growth and evaporation processes are investigated analytically using a Green's function approach. Integro-differential equations of motion for the steps are derived; and a systematic linear stability analysis is carried out treating simultaneously perturbations both along and perpendicular to the steps. Morphological fluctuations of steadily moving steps in response to ambient thermodynamic noises are also studied within a general Langevin formalism. Finally, a phase field model is developed to investigate the time-dependent, collective motion of steps. An application of the model to a finite step train recovers a variety of kinetic behaviors such as the bunching and spreading of steps.
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