Carrier-dopant exchange interactions in Mn-doped PbS colloidal quantum dots

被引：31
|
作者：
Long, Gen [1 ]
Barman, Biplob [1 ]
Delikanli, Savas [1 ]
Tsai, Yu Tsung [1 ]
Zhang, Peihong [1 ]
Petrou, Athos [1 ]
Zeng, Hao [1 ]
机构：
[1] SUNY Buffalo, Dept Phys, Amherst, NY 14260 USA
来源：
APPLIED PHYSICS LETTERS | 2012年 / 101卷 / 06期
关键词：
DILUTED MAGNETIC SEMICONDUCTORS; MAGNETOOPTICAL PROPERTIES; LEAD CHALCOGENIDES; PHOTODETECTORS; NANOCRYSTALS;
D O I：
10.1063/1.4743010
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Canier-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. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4743010]
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页数：4
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