Tuning of vertical and lateral correlations in self-organized PbSe/Pb1-xEuxTe quantum dot superlattices

The tuning of lateral and vertical correlations in self-organized PbSe/Pb1- xEuxTe quantum dot superlattices by changes in the spacer thicknesses is de monstrated and shown to be due to finite size effects in the dot-dot intera ctions. As a consequence, different dot arrangements such as vertically ali gned dot columns or fee stacking are obtained for a single material system without changes in growth conditions. The different dot superstructures are shown to exhibit a different scaling behavior of the lateral versus vertic al dot separation, as well as a different evolution of dot sizes and shapes .