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Growth model for atomic ordering: the case for quadruple-period ordering in GaAsSb alloys
Iskander G Batyrev1, Andrew G Norman, S B Zhang
1National Renewable Energy Laboratory, Golden, Colorado 80401, USA.
Abstract:
Quadruple-period ordering in GaAsSb alloys is studied both theoretically and experimentally. A growth model is proposed to account for the observed three-dimensional (3D) ordered structure. The model is qualitatively different from the widely accepted surface reconstruction and dimerization-induced ordering models that strictly speaking explain only the in-plane 2D patterns. Here, we show that the already ordered substrate will affect the reconstruction of the growth front with respect to the substrate to ensure a correct stacking of the individual 2D ordered layers into the observed 3D lattice.
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