Anomalous optical magnetic shift of self-assembled GaSb/GaAs quantum dots

被引：5
|
作者：
Lin, Ta-Chun [1 ,2 ]
Li, Liang-Chen [3 ]
Lin, Sheng-Di [1 ,2 ]
Suen, Yuen-Wuu [4 ,5 ,6 ]
Lee, Chien-Ping [1 ,2 ,3 ]
机构：
[1] Natl Chiao Tung Univ, Dept Elect Engn, Hsinchu, Taiwan
[2] Natl Chiao Tung Univ, Inst Elect, Hsinchu, Taiwan
[3] Natl Chiao Tung Univ, Ctr Nano Sci & Technol, Hsinchu, Taiwan
[4] Natl Chung Hsing Univ, Inst Nanosci, Taichung 40227, Taiwan
[5] Natl Chung Hsing Univ, Dept Phys, Taichung 40227, Taiwan
[6] Natl Nano Device Labs, Hsinchu, Taiwan
来源：
JOURNAL OF APPLIED PHYSICS | 2011年 / 110卷 / 01期
关键词：
LOCALIZATION;
D O I：
10.1063/1.3607973
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report the magneto-photoluminescence (PL) measurement results on type-II self-assembled GaSb/GaAs quantum dots with the magnetic field applied in Faraday and Voigt configurations. The emission of the quantum dots exhibited a typical diamagnetic blueshift when the magnetic field was applied in a Faraday configuration. However, when the magnetic field was in the Voigt configuration, an unusual redshift in the emission peak accompanied with a rapid increase of the PL intensity was observed. Guided by numerical calculations, the magnetic field applied in the Voigt configuration is found to provide an additional vertical confinement to electrons, and therefore, substantially enhance the radiative electron-hole recombination. The resulting decrease of the steady-state hole concentration gives rise to the observed anomalous magnetic redshift. (C) 2011 American Institute of Physics. [doi:10.1063/1.3607973]
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页数：4
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