Abstract
Fully confined excitons are investigated in natural quantum dots, which are formed by well-width fluctuations in GaAs/AlAs coupled quantum-well structures. In magnetooptic experiments a population inversion of the Zeeman split levels in the quantum dots is found under the condition of charge injection from the AlAs X-point state. This new phenomenon is explained in terms of spin thermalization in the intermediate indirect exciton state and subsequent tunnelling into the direct quantum-dot state. Population inversion is thereby caused by the associated sign reversal of the effective exciton g-factor.
| Original language | English |
|---|---|
| Pages (from-to) | 609-613 |
| Number of pages | 5 |
| Journal | Physica E: Low-Dimensional Systems and Nanostructures |
| Volume | 2 |
| Issue number | 1-4 |
| DOIs | |
| State | Published - 15 Jul 1998 |
Keywords
- Coupled quantum wells
- Quantum dots
- Zeeman effect
- g-factor