We measure the dynamics of the quantum phase coherence of the wave function describing interacting electrons and holes optically excited into the continuum of a GaAs/AlGaAs quantum well. We achieve this by spectrally resolving both the transient four-wave mixing signal and the differential transmission signal arising from such interacting carriers. We observe a dynamical blue shift of the coherent four-wave mixing emission spectrum with respect to the excitation laser pulse and interpret this as a direct manifestation of the dynamic Coulomb correlation effects in this many-body system.
© 1996 Optical Society of America
Mary-Ann Mycek, Jean-Yves Bigot, Ilias E. Perakis, and Daniel S. Chemla, "Measuring the ultrafast dynamics of Coulomb correlation effects: Dephasing in nonequilibrium Fermi seas," J. Opt. Soc. Am. B 13, 1284-1290 (1996)