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Research output: Contribution to Journal/Magazine › Journal article › peer-review
| Article number | 081302 |
|---|---|
| <mark>Journal publication date</mark> | 10/08/2004 |
| <mark>Journal</mark> | Physical review B |
| Issue number | 8 |
| Volume | 70 |
| Number of pages | 4 |
| Publication Status | Published |
| <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.