||W. H. Knox, D. A. B. Miller, T. C. Damen, D.
S. Chemla, C. V. Shank and A. C. Gossard, "Subpicosecond Excitonic Electroabsorption
in Room-Temperature Quantum Wells," Appl. Phys. Lett. 48, 864-866 (1986).
authors investigate the dynamics of excitonic optical absorption in room-temperature GaAs
quantum wells during the application of a rapidly changing electric field in the plane of
the quantum well layers. They obtain electroabsorptive modulation with a response time
constant of 330 fs, which is the fastest ever reported in a semiconductor
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