Abstract
We show that a diatomic dot molecule made of two identical, vertically stacked, strained self-assembled dots exhibits an asymmetry in its single- and many-particle wave functions. The single particle wave function is asymmetric due to the inhomogeneous strain, while the asymmetry of the many-particle wave functions is caused by the correlation-induced localization: the lowest singlet and triplet states show that the two electrons are each localized on different dots within the molecule; for the next singlet states both electrons are localized on the same (bottom) dot for interdot separation . The singlet-triplet splitting is found to be at interdot separation and as large as for , orders of magnitude larger than the few meV found in the large electrostatically confined dots.
- Received 21 March 2005
DOI:https://doi.org/10.1103/PhysRevB.72.081311
©2005 American Physical Society