Abstract
The factor of a single self-assembled quantum dot is tuned by applying an electrical bias voltage. Individual InGaAs quantum dots embedded in a stripe mesa structure sandwiched by Schottky electrodes are studied by photoluminescence measurements. We find that under applied magnetic field a dot with an asymmetric shift for applied bias voltage shows an increase of the exciton -factor absolute value by about 8%, while most of the dots with relatively symmetric shifts show no significant change. The anomalous -value increase is discussed in terms of the Kondo effect.
- Received 22 May 2007
DOI:https://doi.org/10.1103/PhysRevB.76.041301
©2007 American Physical Society