Abstract
Single dot photoluminescence spectroscopy was used to study the homogeneous linewidth of the ground-state exciton in quantum dots as function of temperature T. In high resolution experiments at 2 K, we find a linewidth that is limited by the excitonic lifetime corresponding to a dephasing time of almost a ns. The approximately linear increase of Γ with temperature up to at 60 K is considerably weaker than in structures of higher dimensionality. For higher T we observe a strong enhancement of the linewidth reaching eventually a few meV at room temperature that depends on the confined electronic shell structure.
- Received 11 November 2001
DOI:https://doi.org/10.1103/PhysRevB.65.041308
©2002 American Physical Society