Title: Anomalous optical magnetic shift of self-assembled GaSb/GaAs quantum dots
Authors: Lin, Ta-Chun
Li, Liang-Chen
Lin, Sheng-Di
Suen, Yuen-Wuu
Lee, Chien-Ping
Department of Electronics Engineering and Institute of Electronics
Center for Nanoscience and Technology
Issue Date: 1-Jul-2011
Abstract: 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]
URI: http://dx.doi.org/10.1063/1.3607973
ISSN: 0021-8979
DOI: 10.1063/1.3607973
Volume: 110
Issue: 1
End Page: 
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