Circular dichroism in InAs/GaAs quantum dots:: Confinement-induced magnetism

被引：2
|
作者：
Bogaart, E. W. [1 ]
Haverkort, J. E. M. [1 ]
Mano, T. [1 ]
van Lippen, T. [1 ]
Hamhuis, G. J. [1 ]
Noetzel, R. [1 ]
机构：
[1] Eindhoven Univ Technol, Dept Appl Phys, NL-5600 MB Eindhoven, Netherlands
来源：
PHYSICAL REVIEW B | 2006年 / 74卷 / 15期
关键词：
D O I：
10.1103/PhysRevB.74.153307
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Self-assembled InAs/GaAs quantum dots (QDs) are studied by means of circular polarization-resolved photoluminescence and pump-probe differential reflectivity as a function of the excitation density using a linear polarized pump laser. We observe an unexpected large circular polarization anisotropy, which decreases with increasing excitation density for both experimental techniques. Comparison of the respective polarization degrees reveals a ratio of approximately 0.2. Moreover, the reflection measurements reveal circular dichroism with a ratio of Theta(+)/Theta(-)=1.16. Circular dichroism in semiconductor QDs can be explained by the induced magnetism as a result of light confinement in QDs, providing an anisotropic coupling between the pump-induced QD exciton and the circularly polarized probe field.
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页数：4
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