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Carrier-Dopant Exchange Interactions in Mn-doped PbS Colloidal Quantum Dots

Carrier-dopant exchange interactions in Mn-doped PbS colloidal quantum dots were studied by circularly polarized magneto-photoluminescence. Mn substitutional doping leads to paramagnetic behavior down to 5 K. While undoped quantum dots show negative circular polarization, Mn doping changes its sign to positive. A circular polarization value of 40% was achieved at T=7 K and B=7 tesla. The results are interpreted in terms of Zeeman splitting of the band edge states in the presence of carrier-dopant exchange interactions that are qualitatively different from the s,p-d exchange interactions in II-VI systems.

preprint2012arXivOpen access
Gen LongBiplob BarmanSavas DelikanliYu Tsung TsaiPeihong ZhangAthos PetrouHao Zeng
cond-mat.mes-hall
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Gen LongBiplob BarmanSavas DelikanliYu Tsung TsaiPeihong ZhangAthos PetrouHao Zeng

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