Abstract

We discuss how the different nature of excitonic effects in modulation-doped quantum wells or metals (Fermi edge singularity) and undoped semiconductors (atomic excitons) manifests itself strongly in the nonlinear absorption spectrum for off-resonant pump excitation. We study this problem by extending our previous theoretical study of the Fermi edge singularity in linear absorption and obtain a new intuitive picture that extracts the physics conveyed by our experimental results. We point out that, in addition to phase-space filling, the pump-induced polarization increases the carrier effective masses and, as a result, can enhance excitonic resonances.

© 1996 Optical Society of America

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