title: Optical Stark effect on excitons in GaAs quantum wells.
abstract: We describe the first reported experimental observation of an extremely fast shift of the n = 1 exciton transition energy in GaAs quantum-well heterostructures. The shift is produced by optical pumping below the band gap and is not associated with a carrier or exciton population. We interpret the shift in terms of an optical Stark effect. We present a model for the Stark effect on the ground-state exciton in quantum wells and find good agreement between the predictions of the model and our experimental results.
authors.forename: A
authors.initials: A
authors.lastname: Von Lehmen
authors.forename: D S
authors.initials: DS
authors.lastname: Chemla
authors.forename: J E
authors.initials: JE
authors.lastname: Zucker
authors.forename: J P
authors.initials: JP
authors.lastname: Heritage