Surface Diffusion and Electromigration on Vicinal Surfaces During Sublimation
Electromigration affected sublimation is a very interesting case of surface transport, coupled to a process of atom exchange between the two-dimensional gas of adatoms and the crystal phase. This exchange takes place at each step and its rate (lower or higher than the adatom flux on the surface) could considerably change the physics of the surface processes and the evolution of the surface shape. The two limiting cases — a) intensive exchange between the adlayers at neighbouring terraces and b) zero exchange between them (the adlayer exchanges atoms only with the crystal phase) have been considered. The equations of step motion are derived for each case (for the case (a) the considerations are restricted to a pair of steps). and some results of the numerical integration are presented. The relation to the continuum model is also discussed.
KeywordsCrystal Surface Crystal Phase Step Edge Step Motion Surface Transport
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