Step Repulsion Mediates Wandering on a Si(001) Vicinal Face

Details Step Repulsion Mediates Wandering on a Si(001) Vicinal Face Step Repulsion Mediates Wandering on a Si(001) Vicinal Face

2002-10-16

arxiv.org/abs/cond-mat/0210335v1

Physics

Condensed Matter

Materials Science

4 pages, 5 figures, REVTEX4

Scientific paper

With a Si(001) vicinal surface in mind, we study step wandering instability on a vicinal surface with an anisotropic surface diffusion whose orientation dependence alternates on each consecutive terrace. In a conserved system step wandering takes place with step-up adatom drift. Repulsive interaction between steps is found indispensable for the instability. Monte Carlo simulation with a strong repulsive step interaction confirms the result of linear stability analysis, and further shows that in-phase step wandering produces straight grooves. Grooves widen as their amplitudes increase in proportion to the square root of time.

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