Abstract

The motion of steps in a surface diffusion field with asymmetric step kinetics is studied. An effective attraction from interference of the diffusion field causes a kinematical binding transition of two repulsive steps if undersaturation exceeds a critical value. This binding transition leads to a nonlinear growth law, V\ensuremath{\sim}-\ensuremath{\Vert}\ensuremath{\delta}c${\mathrm{\ensuremath{\Vert}}}^{2/3}$, for \ensuremath{\delta}c0. If there is a third step at a distance, it collides with the pair and recombination takes place. In a step train this recombination is repeated.

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