Abstract
The vertical and lateral ordering of quantum dot superlattices is dependent on theelastic stress/strain fields induced by the buried quantum dots within theprevious superlattice layers. It has been found that quantum dots may bevertically correlated or may exhibit anti-correlation for different materialsystems. These differences are caused by the elastic anisotropy as well as thecrystallographic orientation of the materials. The finite element method isused in this work to investigate the effects of anisotropy of the elasticproperty and crystal orientation on the elastostatic fields of quantum dotsuperlattices. The strain energy density distribution obtained from thecalculations can be used to deduce the locations whereby subsequentquantum dot islands will nucleate by locating the minima positions. Atetragonal body centred arrangement is observed for the CdSe/ZnSe(001)system with a sufficiently thick spacer layer. Through comparison with aless anisotropic system (InAs/GaAs), it is shown that an increase in thedegree of anisotropy favours an anti-correlated island growth. Spatialcorrelation in different crystal orientations is also investigated and discussed.
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