Coarsening of Surface Structures in Unstable Epitaxial Growth

Details Coarsening of Surface Structures in Unstable Epitaxial Growth Coarsening of Surface Structures in Unstable Epitaxial Growth

1996-11-26

arxiv.org/abs/cond-mat/9611206v2

Physics

Condensed Matter

Statistical Mechanics

15 pages, Latex. Submitted to PRE

Scientific paper

10.1103/PhysRevE.55.3952

We study unstable epitaxy on singular surfaces using continuum equations with a prescribed slope-dependent surface current. We derive scaling relations for the late stage of growth, where power law coarsening of the mound morphology is observed. For the lateral size of mounds we obtain $\xi \sim t^{1/z}$ with $z \geq 4$. An analytic treatment within a self-consistent mean-field approximation predicts multiscaling of the height-height correlation function, while the direct numerical solution of the continuum equation shows conventional scaling with z=4, independent of the shape of the surface current.

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