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

Abstract

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.

11 pages, 4 figures; revised and extended version

References in corpus (3)

• Dynamic phase transitions in electromigration-induced step bunching
• Instabilities at vicinal crystal surfaces - competition between the electromigration of the adatoms and the kinetic memory effect
• Anti-Coarsening and Complex Dynamics of Step Bunches on Vicinal Surfaces during Sublimation