Morphological stability of electromigration-driven vacancy islands

Details Morphological stability of electromigration-driven vacancy islands Morphological stability of electromigration-driven vacancy islands

2007-01-10

arxiv.org/abs/cond-mat/0701208v2

Physical Review E, 2007, 75(4 Pt 2):046210

Physics

Condensed Matter

Materials Science

12 pages

Scientific paper

The electromigration-induced shape evolution of two-dimensional vacancy islands on a crystal surface is studied using a continuum approach. We consider the regime where mass transport is restricted to terrace diffusion in the interior of the island. In the limit of fast attachment/detachment kinetics a circle translating at constant velocity is a stationary solution of the problem. In contrast to earlier work [O. Pierre-Louis and T.L. Einstein, Phys. Rev. B 62, 13697 (2000)] we show that the circular solution remains linearly stable for arbitrarily large driving forces. The numerical solution of the full nonlinear problem nevertheless reveals a fingering instability at the trailing end of the island, which develops from finite amplitude perturbations and eventually leads to pinch-off. Relaxing the condition of instantaneous attachment/detachment kinetics, we obtain non-circular elongated stationary shapes in an analytic approximation which compares favorably to the full numerical solution.

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