Morphological instability of growing interface in diffusion field with a flow

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We studied morphological instability of growing vicinal face in the diffusion field with a flow. On a vicinal face, steps show two types of instabilities, step wandering and step bunching. In our study, we considered a growing vicinal face in a solution and studied the condition to cause the step instabilities and the motion of each step. We showed that during step bunching, separation and collision repeatedly occurs.