G. Finkelstein et al., BIEXCITONIC EFFECTS IN TRANSIENT NONLINEAR-OPTICAL EXPERIMENTS IN QUANTUM-WELLS, Physical review. B, Condensed matter, 47(19), 1993, pp. 12964-12967
We present a model for the nonlinear optical response of quantum wells
, which includes biexcitons. We show that within this model, the inter
action of two laser pulses, mediated by the nonlinear susceptibility,
results in oscillations and in coupling between sigma+ and sigma- exci
tons. This explains the temporal behavior of the differential absorpti
on and four-wave mixing in recent experiments [Phys. Rev. Lett. 68, 34
9 (1992); 68, 1880 (1992)]. The oscillations have a frequency equal to
the biexciton binding energy, and are different from known interferen
ce and quantum beat phenomena.