Abstract
Quantum beats probe energy gaps and coherences, including the nonradiative Raman correlation between the light- and heavy-hole valence bands. A recent analysis of lh-hh quantum beats in four-wave mixing (FWM) in a multiple-quantum- well (MQW)1 illustrates the potential of this technique. But like many studies before and since, that work relied on ultrashort (~100 fs) pulses to excite both the hh and lh exciton transitions simultaneously in a self-diffraction geometry. Large-bandwidth FWM experiments produce polarization beats, irrespective of the presence of quantum beats, and are complicated by disorder.2
© 1996 Optical Society of America
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