| Issue |
Le Journal de Physique IV
Volume 03, Number C5, Octobre 1993
Third International Conference on Optics of Excitons in Confined
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|
|---|---|---|
| Page(s) | C5-15 - C5-18 | |
| DOI | https://doi.org/10.1051/jp4:1993503 | |
Third International Conference on Optics of Excitons in Confined
Le Journal de Physique IV 03 (1993) C5-15-C5-18
DOI: 10.1051/jp4:1993503
Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria
© EDP Sciences 1993
Le Journal de Physique IV 03 (1993) C5-15-C5-18
DOI: 10.1051/jp4:1993503
Heavy-hole intersubband transition of resonantly excited excitons in quantum wells
R.A. HÖPFEL and R. RODRIGUESInstitut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria
Abstract
The exciton population in a higher subband of GaAs quantum wells, below the free carrier continuum, is studied by time-resolved luminescence spectroscopy. The lifetime of the exciton formed by an electron of the lowest subband and a heavy hole of the second subband is determined as 130 ± 20 ps, in agreement with theoretical estimations of intersubband scattering based on acoustic phonon emission. The exciton lifetime in the second heavy-hole subband is considerably longer than reported values of the recombination time in the lowest exciton state at k=0. These findings lead to novel intersubband laser concepts based on excitons.
© EDP Sciences 1993