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/Pb 1-xEu xTe quantum dot superlattices by changes in the spacer thicknesses is demonstrated and shown to be due to finite size effects in the dot-dot interactions. As a consequence, different dot arrangements such as vertically aligned dot columns or fcc 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 vertical dot separation, as well as a different evolution of dot sizes and shapes.
Springholz
G
Institut fur Halbleiter- und Festkorperphysik, Johannes Kepler Universitat, A-4040 Linz, Austria.
Pinczolits
M
Mayer
P
Holy
V
Bauer
G
Kang
HH
Salamanca-Riba
L