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

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  • M Hayne
  • O Razinkova
  • S Bersier
  • R Heitz
  • L Muller-Kirsch
  • M Geller
  • D Bimberg
  • V V Moshchalkov
Article number081302
<mark>Journal publication date</mark>10/08/2004
<mark>Journal</mark>Physical review B
Issue number8
Number of pages4
Publication StatusPublished
<mark>Original language</mark>English


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.