Abstract
Excitons confined to CdSe/ZnSe self-assembled quantum dots are probed through a nanoaperture using time-resolved photoluminescence. Significant evidence is shown that two different electronic states are associated with these dots, with binding energies which differ by an order of magnitude. The first has a short 450 ps lifetime, exhibits a relatively broad emission line, and persists nearly to room temperature; the second exhibits a long lifetime and is responsible for the sharp lines seen at low temperatures . These results are completely unlike those seen in III-V dots, and reveal the complexity of the electronic structure in CdSe dots.
- Received 27 April 1999
DOI:https://doi.org/10.1103/PhysRevLett.83.2797
©1999 American Physical Society