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Electroluminescence spectra at different current densities . Each spectrum consists of approximately longitudinal modes. The stricture marked by an arrow in every spectrum is due to excitonic absorption. A wide range around each stricture is magnified in the insets.
Solid curves: gain spectra for current densities , , , and as in Fig. 1. For clarity the spectra are shifted by , , , and , respectively. Dotted curve: spontaneous electroluminescence spectra.
Spectra of the differential change of the refractive index with current density for the same current densities , , , and as in Fig. 2. For clarity the spectra are shifted by , , , and , respectively.
Spectral position of the exciton resonance (squares) and peak gain (triangles) as function of the current density. The solid lines are linear fits to the data points. The corresponding shift rates of the exciton resonance and the peak gain are 4.9 and , respectively.
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