COULOMB CORRELATION AND BAND-GAP RENORMALIZATION AT HIGH CARRIER DENSITIES IN QUANTUM WIRES

We have studied the luminescence of narrow quantum wires at photoexcit ation densities of up to similar to 3 x 10(6) cm(-1). We show that eve n at these densities, which are well above the expected Mott density o f 8 x 10(5) cm(-1), excitonic recombination dominates over other recom bination channels in stark contrast with the behavior of quantum wells and bulk structures at equivalent densities. As we observe no signifi cant shift in the peak energy with density, an upper limit to the band gap renormalization can be set.