Detailed balance between impact ionization and Auger recombination of trions in GaAs/AlAs quantum wells
✍ Scribed by A. Manassen; E. Cohen; A. Ron; E. Linder; L.N. Pfeiffer
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 76 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0749-6036
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✦ Synopsis
We studied the photoluminescence of (e1:hh1)1S excitons (X ) and negatively charged excitons (trions, X -) in quantum wells (QWs) having a low density (n e < 5 × 10 10 cm -2 ) two-dimensional electron gas (2DEG). Mixed type I-type II GaAs/AlAs quantum wells are studied in which the 2DEG is photogenerated in the type I QWs and n e is determined by the excitation intensity. We find that, while for T ≤ 12 K, the X and X -relative intensities can be described as a system of two levels at equilibrium, it cannot be so described for T ≥ 16 K. The most pronounced difference between the two temperatures is that for n e < 5×10 9 cm -2 , the X -intensity decreases with increasing n e in favor of the X intensity. This and other observations are interpreted as due to deviations from the detailed balance between X - formation and annihilation processes required for thermodynamic equilibrium.