Dynamical Transitions of a Driven Ising Interface

Abstract

We study the structure of an interface in a three dimensional Ising system created by an external non-uniform field $H(\mathbf{r},t)$. $H$ changes sign over a two dimensional plane of arbitrary orientation. When the field is pulled with velocity ${\mathbf{v}}_e$, (i.e. $H(\mathbf{r},t)=H(\mathbf{r}-{\mathbf{v}}_{\mathbf{e}}t)$), the interface undergoes a several dynamical transitions. For low velocities it is pinned by the field profile and moves along with it, the distribution of local slopes undergoing a series of commensurate-incommensurate transitions. For large ${\mathbf{v}}_e$ the interface de-pinns and grows with KPZ exponents.

4 pages 3 .eps figures

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