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

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 structure...

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Bibliographic Details
Published in:Nanotechnology 2008-03, Vol.19 (12), p.125706-125706 (4)
Main Authors: Hewaparakrama, K P, Mackowski, S, Jackson, H E, Smith, L M, Heiss, W, Karczewski, G
Format: Article
Language:English
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Summary: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.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/19/12/125706