Stochastic Model for Surface Erosion Via Ion-Sputtering: Dynamical Evolution from Ripple Morphology to Rough Morphology

Abstract

Surfaces eroded by ion-sputtering are sometimes observed to develop morphologies which are either ripple (periodic), or rough (non-periodic). We introduce a discrete stochastic model that allows us to interpret these experimental observations within a unified framework. We find that a periodic ripple morphology characterizes the initial stages of the evolution, whereas the surface displays self-affine scaling in the later time regime. Further, we argue that the stochastic continuum equation describing the surface height is a noisy version of the Kuramoto-Sivashinsky equation.

4 pages, 7 postscript figs., Revtex, to appear in Phys. Rev. Lett

References in corpus (2)

• Dynamic Scaling of Ion-Sputtered Surfaces
• Renormalization Group Analysis of a Noisy Kuramoto-Sivashinsky Equation

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