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Nanotechnology. 2008 Mar 26;19(12):125706. doi: 10.1088/0957-4484/19/12/125706. Epub 2008 Feb 21.

Tuning spin properties of excitons in single CdTe quantum dots by annealing.

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Department of Physics, University of Cincinnati, Cincinnati, OH 45221-0011, USA.


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.

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