Biexcitonic complexes in a ZnSe single quantum well are investigated by spectrally resolved four-wave mixing (FWM). The formation of heavy-heavy-hole XXₕ and of mixed heavy-light-hole XXₘ biexcitons showing binding energies of Δₕ=4.8meV and Δₘ=2.8meV is identified by polarization selection rules. The coherent dynamics of the FWM response and the observed FWM intensity ratio between the XXₕ and XXₘ biexciton-induced nonlinear signals are in agreement with the solution of an extended optical Bloch equation.
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Wagner et al. (1999) studied this question.
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