title: Tuning spin properties of excitons in single CdTe quantum dots by annealing.
abstract: Using polarization-resolved photoluminescence imaging in external magnetic fields we measure statistically significant distributions of exchange splitting, diamagnetic shift and effective g-factor of excitons in tens of single CdTe quantum dots. Comparison between the as-grown and annealed structures shows strong suppression of ensemble inhomogeneities, with the average exchange splitting reduced by half and significant narrowing of the g-factor distribution. Remarkably, the average value of the excitonic g-factor remains unchanged. This unique ability to yield highly uniform quantum dot ensembles without hampering the exciton Zeeman splitting makes annealing a highly attractive means for tuning the spin properties of quantum dot excitons.
authors.affiliation: Department of Physics, University of Cincinnati, Cincinnati, OH 45221-0011, USA.
authors.forename: K P
authors.initials: KP
authors.lastname: Hewaparakrama
authors.forename: S
authors.initials: S
authors.lastname: Mackowski
authors.forename: H E
authors.initials: HE
authors.lastname: Jackson
authors.forename: L M
authors.initials: LM
authors.lastname: Smith
authors.forename: W
authors.initials: W
authors.lastname: Heiss
authors.forename: G
authors.initials: G
authors.lastname: Karczewski