Abstract
Time resolved reflectivity measurements of multiple-quantum-well Bragg structures show a strong reduction of the reflectivity at increased excitation levels. At low intensities, a pump-induced contrast of more than 20% in the reflectivity of a 10 quantum well Bragg structure is observed and attributed to the superradiant coupling between the quantum-well excitons. This superradiant state is gradually suppressed for increasing excitation densities due to rapid loss of phase coherence via excitation induced dephasing.
Original language | English (US) |
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Pages (from-to) | 105-108 |
Number of pages | 4 |
Journal | Solid State Communications |
Volume | 105 |
Issue number | 2 |
DOIs | |
State | Published - Jan 1998 |
ASJC Scopus subject areas
- Chemistry(all)
- Condensed Matter Physics
- Materials Chemistry