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Publication # 110

W. H. Knox, D. S. Chemla, and D. A. B. Miller, "Femtosecond ac Stark Effect in Semiconductor Quantum Wells: Extreme Low- and High-Intensity Limits," Phys. Rev. Lett., 62, 1189-1192, (1989).

The authors 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. They also show that DC fields applied perpendicular to the layers reduce the excitonic AC Stark effect

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