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

Ta Chun Lin*, Liang Chen Li, Sheng-Di Lin, Yuen Wuu Suen, Chien Ping Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

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.

Original languageEnglish
Article number013522
JournalJournal of Applied Physics
Volume110
Issue number1
DOIs
StatePublished - 1 Jul 2011

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