Abstract

The electronic properties of Fe/GaAs(1 0 0) depend on the energetics of the GaAs(1 0 0)-(2×4) reconstruction as well as on the relaxation of Fe layers. Employing a pseudopotential ab initio method, we show that the GaAs(0 0 1)-(2×4) As-terminated surface is composed of two Ga and two As dimers with dimer axes perpendicular to each other in agreement with experiment. The influence of relaxing all atoms on the Schottky barrier has been calculated for different super-cell sizes showing a trend towards larger barrier heights for larger volumes of the Fe layers.

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