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Time-integrated PL spectra at from sample 1 for several excitation energies tuned below the bandgap. The corresponding excitation-power flux is about . The free exciton PL is very weak, implying that exciton-impurity capture is efficient.
(a) Time-integrated PL spectra from sample 2 at under OTGE for . The inset plots the observed redshift of the biexciton peak as a function of the excitation power. (b) Time-integrated PL spectra under ATPE at for .
Measured steady-state densities for (solid dots) and (open circles) from Fig. 2(a) (OTGE) and (solid squares) and (open squares) from Fig. 2(b) (ATPE), respectively. The dashed (solid) curves are our best fits to the data under one-photon (two-photon) excitation of excitons.
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