Convective instability on a crystal surface

Details Convective instability on a crystal surface Convective instability on a crystal surface

2000-10-05

arxiv.org/abs/cond-mat/0010080v1

Physics

Condensed Matter

Materials Science

4 pages + 5 postscript figure files

Scientific paper

The distinction between absolute and convective instabilities is well known in the context of hydrodynamics and plasma physics. In this Letter, we examine an epitaxial crystal growth model from this point of view and show that a strain-induced step bunching instability can be convective. Using analytic stability theory and numerical simulations, we study the response of the crystal surface to an inhomogeneous deposition flux that launches impulsive and time-periodic perturbations to a uniform array of steps. The results suggest a new approach to morphological patterning.

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