Blue Shift of the Exciton Resonance due to Exciton-Exciton Interactions in a Multiple-Quantum-Well Structure

Abstract
Femtosecond time-resolved dynamics of exciton screening and pairing is studied in a 53-Å GaAs multiple-quantum-well structure at 15 and 224 K. An intriguing high-energy shift of the exciton self-energy in the dense limit is reported.