Fast coarsening in unstable epitaxy with desorption

Details Fast coarsening in unstable epitaxy with desorption Fast coarsening in unstable epitaxy with desorption

1998-11-02

arxiv.org/abs/cond-mat/9811016v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 PostScript figures

Scientific paper

10.1103/PhysRevE.59.R6263

Homoepitaxial growth is unstable towards the formation of pyramidal mounds when interlayer transport is reduced due to activation barriers to hopping at step edges. Simulations of a lattice model and a continuum equation show that a small amount of desorption dramatically speeds up the coarsening of the mound array, leading to coarsening exponents between 1/3 and 1/2. The underlying mechanism is the faster growth of larger mounds due to their lower evaporation rate.

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