PHASE-SPACE FILLING AND BAND-GAP RENORMALIZATION IN THE LUMINESCENCE OF HIGHLY EXCITED INGAAS GAAS QUANTUM WIRES/

The influence of many-body effects in one-dimensional (1D) electron-ho le (e-h) plasmas on the multi-subband emission of InGaAs/GaAs modulate d-barrier quantum well wires (qww's) is investigated. A detailed model ling of the measured photoluminescence (PL) for various excitation int ensities permits a clear demonstration of several many-body effects in the spectra. In particular, we observe a transition of an exciton to a plasma emission, and the saturation of the plasma emission of differ ent lateral subband transitions due to band filling. The analysis yiel ds a significant band gap renormalization. The observed red-shifts par ticularly of the low-energy wings of the spectra are explained in term s of an incomplete compensation between the band edge shifts and the e xcitonic correlations in these 1D structures.