Abstract
Self-assembled quantum dots (QD's) have been studied by single dot magnetophotoluminescence spectroscopy ( ). At a splitting of the exciton ( ) emission is observed which we ascribe to an asymmetry of the confinement potential. With increasing the emission splits into a quadruplet corresponding to the and states, which originates from a reduction of the cubic symmetry of the QD's. From the spectroscopic data we obtain values for the electron ( ) and hole ( ) factors. We also determine the singlet-triplet splitting which is found to be enhanced over bulk values by about an order of magnitude due to the increase of the overlap in the QD's.
- Received 5 October 1998
DOI:https://doi.org/10.1103/PhysRevLett.82.1748
©1999 American Physical Society