Time-resolved nonlinear luminescence of biexcitons in ZnSe-${\mathrm{Zn}}_{\mathit{x}}$${\mathrm{Mg}}_{1\mathrm{-}\mathit{x}}$${\mathrm{S}}_{\mathit{y}}$${\mathrm{Se}}_{1\mathrm{-}\mathit{y}}$ single quantum wells

Nonlinear optical properties of dense excitonic systems in ZnSe-${\mathrm{Zn}}_{\mathit{x}}$ ${\mathrm{Mg}}_{1\mathrm{-}\mathit{x}}$ ${\mathrm{S}}_{\mathit{y}}$ ${\mathrm{Se}}_{1\mathrm{-}\mathit{y}}$ single quantum wells have been studied by means of time-resolved nonlinear luminescence spectroscopy, based on an excitation correlation technique. The enhancement in luminescence efficiency of biexcitons was clearly observed in a time-correlation trace of nonlinear biexciton luminescence. The origin of the enhancement was attributed to the stimulation of biexciton luminescence.