Abstract
We present photoluminescence spectra from single InAs/GaAs quantum dots embedded in a Schottky diode heterostructure. The pronounced Coulomb blockade can be exploited to change the exciton charge in discrete steps from +6e to -8e via an applied gate voltage. The results demonstrate a number of effects. The spectra of highly negatively charged excitons are dominated by configuration interactions in the final state, a viewpoint supported by few-electron calculations based on a harmonic oscillator potential. The positively charged excitons on the other hand show a very different behavior that can only be explained by taking strong spin-orbit coupling for the holes into account. Particularly, a hole charging sequence is revealed that defies Hund's rule as well as the Aufbau principle. Finally, photoluminescence from excited states offers direct access to the hole quantization energy. © 2006 WILEY-VCH Verlag GmbH & Co. KGaA.
Original language | English |
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Pages (from-to) | 3806-3810 |
Number of pages | 5 |
Journal | Physica Status Solidi C - Current Topics in Solid State Physics |
Volume | 3 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2006 |
Event | 4th International Conference on Semiconductor Quantum Dots - Chamonix-Mont Blanc, France Duration: 1 May 2006 → 5 May 2006 |