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W. H. Knox, C. Hirlimann, D. A. B. Miller,
J. Shah, D. S. Chemla and C. V. Shank, "Femtosecond Excitation of Nonthermal Carrier
Populations in GaAs Quantum Wells," Phys. Rev. Lett. 56, 1191-1193 (1986). The
authors report the first direct observation of nonthermal photoexcited carrier
distributions in GaAs quantum-well structures. They present experimental studies which
show that these distributions thermalize within 200 fs. In addition they are able to show
that near the band edge the effect of long-range Coulomb screening on the bleaching of the
two-dimensional-exciton resonances is much weaker than that of the Pauli exclusion
principle
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