Optically induced charging effects in self-assembled GaSb/GaAs quantum dots

Hayne, M and Razinkova, O and Bersier, S and Heitz, R and Muller-Kirsch, L and Geller, M and Bimberg, D and Moshchalkov, V V (2004) Optically induced charging effects in self-assembled GaSb/GaAs quantum dots. Physical review B, 70 (8). ISSN 1550-235X

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Abstract

We report photoluminescence (PL) measurements on self-assembled GaSb/GaAs quantum dots. As the laser excitation is increased from very low levels, the PL shows a strong red shift, and then a blue shift, such that it presents a U-shaped curve. Raising the temperature causes a large (<100 meV) blue shift of the PL, and shifts the minimum of the PL energy versus laser excitation curve to higher laser powers. Applying a magnetic field at lasers powers much less than1 W cm(-2) red shifts the PL energy. We explain these effects by population or depopulation of dots that are filled in the dark with holes supplied by carbon acceptors.

Item Type:
Journal Article
Journal or Publication Title:
Physical review B
Subjects:
ID Code:
49485
Deposited By:
Deposited On:
12 Aug 2011 08:41
Refereed?:
Yes
Published?:
Published
Last Modified:
05 Dec 2020 01:22