Abstract
The elastic interaction energy between a point defect or an adatom and a step is calculated. The defect is represented by a localized dipole force while the presence of the step is modelled by a distribution of dipole forces on half of the surface plane. The interaction energy changes sign when the defect goes through the plane perpendicular to the surface and containing the edge of the step. For an adatom, this energy behaves like the inverse of its distance to the edge of the step ; it is attracted to the step on one terrace and repelled from it on the other terrace.
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