Non-conserved dynamics of steps on vicinal surfaces during electromigration-induced step bunching

Details Non-conserved dynamics of steps on vicinal surfaces during electromigration-induced step bunching Non-conserved dynamics of steps on vicinal surfaces during electromigration-induced step bunching

2011-09-19

arxiv.org/abs/1109.4046v2

European Physical Journal B 85 (2012) 72

Physics

Condensed Matter

Statistical Mechanics

11 pages, 4 figures; revised and extended version

Scientific paper

We report new results on the non-conserved dynamics of parallel steps on vicinal surfaces in the case of sublimation with electromigration and step-step interactions. The derived equations are valid in the quasistatic approximation and in the limit $f^{-1}\gg l_D\gg l_{\pm} \gg l_i$, where $f$ is the inverse electromigration length, $l_D$ the diffusion length, $l_{\pm}$ the kinetic lengths and $l_i$ the terrace widths. The coupling between crystal sublimation and step-step interactions induces non-linear, non-conservative terms in the equations of motion. Depending on the initial conditions, this leads to interrupted coarsening, anticoarsening of step bunches or periodic switching between step trains of different numbers of bunches.

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