Carrier-Dopant Exchange Interactions in Mn-doped PbS Colloidal Quantum Dots
| Autor: | Long, Gen, Barman, Biplob, Delikanli, Savas, Tsai, Yu Tsung, Zhang, Peihong, Petrou, Athos, Zeng, Hao |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Appl. Phys. Lett. 101, 062410 (2012) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/1.4743010 |
| Popis: | 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. Comment: 4 pages, 4 figures; To appear in Applied Physics Letters 101 (2012) |
| Databáze: | arXiv |
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