title: Growth model for atomic ordering: the case for quadruple-period ordering in GaAsSb alloys.
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.
authors.affiliation: National Renewable Energy Laboratory, Golden, Colorado 80401, USA.
authors.forename: Iskander G
authors.initials: IG
authors.lastname: Batyrev
authors.forename: Andrew G
authors.initials: AG
authors.lastname: Norman
authors.forename: S B
authors.initials: SB
authors.lastname: Zhang
authors.forename: Su-Huai
authors.initials: SH
authors.lastname: Wei