By embedding a layer of self-assembled quantum dots into a field-effect structure, we are able to control the exciton charge in a single dot. We present the results of photoluminescence experiments as a function of both charge and magnetic field. The results demonstrate a hierarchy of energy scales determined by quantization, the direct Coulomb interaction, the electron-electron exchange interaction, and the electron-hole exchange interaction. For excitons up to the triply charged exciton, the behavior can be understood from a model assuming discrete levels within the quantum dot. For the triply charged exciton, this is no longer the case. In a magnetic field, we discover a coherent interaction with the continuum states, the Landau levels associated with the wetting layer. © 2004 Elsevier B.V. All rights reserved.
|Number of pages||6|
|Journal||Physica E: Low-Dimensional Systems and Nanostructures|
|Publication status||Published - Feb 2005|
|Event||International Conference on Quantum Dots - Banff, Alberta, Canada|
Duration: 10 May 2004 → 13 May 2004
- Landau level
- Quantum dots