Figure 3: Self-consistent SP simulation results, exciton and biexciton emission energy and broadening, and BGR as a function of injected carrier density in the QW.
From: Biexcitonic molecules survive excitons at the Mott transition
(a) Results of SP simulations for the e–h wavefunction overlap (black curve) and shift in exciton energy because of screening of the built-in electric field in the QW (red solid curve) compared with the experimental values of the exciton emission energy shift (red circles). The error bars are the standard deviations of the fitting of experimental data with two Voigt functions for excitons and biexcitons. (b) Energy of the exciton and biexciton transitions (red and black circles, respectively) in addition to their full-width at half-maximum (FWHM) energies (shown by dashed lines) as a function of the QW carrier density. The energy difference between exciton and biexciton energies, that is, the biexciton-binding energy, remains constant over the entire power density range. The green circles represent the values of the bandgap extracted from e–h plasma emission modelling. Beyond the MT, the QW emission peak and FWHM energies are shown with blue dots and dashed lines, respectively. It is obvious that they emerge from the biexciton emission band. The green dashed line shows the expected evolution of the band edge because of BGR with α=3.65 × 10−6eV cm2/3 in agreement with refs 20, 22.
