MANY-BODY EFFECTS IN THE MAGNETOPLASMA OF IN0.13GA0.87AS GAAS QUANTUMWIRES/

We have performed photoluminescence experiments on modulated barrier I n0.13Ga0.87As/GaAs quantum wires in normal magnetic fields up to B = 1 0.5 T. By using high excitation powers we observed emission from sever al lateral subbands. In comparison to low excitation spectra the emiss ion features are shifted to lower energies due to band gap renormaliza tion. Calculated luminescence spectra are in excellent agreement with the experimental spectra and have been used to study many-particle eff ects in these wires. We have found clear indications for an enhancemen t of the renormalization in quantum wires as expected due to the incre ase of the Coulomb interaction.