Femtosecond ac Stark effect in semiconductor quantum wells: Extreme low- and high-intensity limits
- 6 March 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 62 (10) , 1189-1192
- https://doi.org/10.1103/physrevlett.62.1189
Abstract
We show that in quasi-2D GaAs quantum wells, below-resonance low-intensity excitation produces a pure shift of the excitons, contrary to ac Stark shifts in atomic systems. At high pump intensities two-photon 3D-real-carrier generation competes with the virtual 2D-exciton effects. We also show that dc fields applied perpendicular to the layers reduce the excitonic ac Stark effect.Keywords
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