Step Instabilities on a Vicinal Face Induced by Flow in Solution

概要

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Considering the growth of a vicinal face from a solution, we carry out Monte Carlo simulations and study step bunching induced by the flow of atoms in a solution. For simplicity, we use two-dimensional diffusion field to represent a solution and a one-dimensional vicinal face. When the flow of atoms in a solution is in the step-down direction, the vicinal face is unstable and step bunching occurs. When the flow is fast, small bunches are formed in the inital stage. The size of bunches increases by the coalescence of small bunches. In a later stage, the coalescence and separation of bunches repeatedly occur, and the size of bunches is saturated. When the flow is slow, the bunches grow from the modulation of step density in the initial stage. The size of bunches increases with time as ${\sim}t^{1/3}$.
2010-06-15