Abstract
We study wandering instability of an isolated step in a surface diffusion field with a direct electric current applied perpendicular to the step. The drift of adatoms caused by the electric current modifies the surface diffusion length. In sublimation the difference between the modified surface diffusion length in the upper terrace and that in the lower terrace causes an instability with respect to fluctuation along the step. This instability occurs when the drift is opposite to the step motion and its strength is within a limited range. Near the lower critical current the step obeys the Kuramoto-Sivashinsky equation, which gives rise to spatiotemporal chaos.
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