Abstract
The energy dependence of the dephasing rate of coherent interband polarization in modulation doped quantum well structures1 will be discussed from a many-body perspective. It will be shown that collective two-dimensional plasmon emission processes associated with both the electron and light-hole wavefunction components of the polarization can be expected to give rise to discontinuities in the dephasing rate as the excitation energy is tuned within < 50 meV above the absorption edge in GaAs quantum wells. The exact position and magnitude of these discontinuities is very sensitive to the approximation used to treat local field effects because of the relatively large wavevector transfers involved in the hot-carrier/Fermi sea interaction. This type of coherent measurement may therefore provide a probe of the exchange-correlation properties of the two dimensional electron gas.
© 1993 Optical Society of America
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