Nonlinear optical study of the Fermi edge singularity: differences from atomic excitons in the virtual excitation regime
- Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 (United States)
- AT&T Bell Laboratories, Holmdel, New Jersey 07733 (United States)
- Physics Department, University of California, Berkeley, and Materials Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
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. {copyright} {ital 1996 Optical Society of America.}
- Research Organization:
- Lawrence Berkeley National Laboratory
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 285896
- Journal Information:
- Journal of the Optical Society of America, Part B: Optical Physics, Journal Name: Journal of the Optical Society of America, Part B: Optical Physics Journal Issue: 6 Vol. 13; ISSN JOBPDE; ISSN 0740-3224
- Country of Publication:
- United States
- Language:
- English
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