INFLUENCE OF SCREENING IN THE MAGNETOOPTICAL PROPERTIES OF A 2-DIMENSIONAL ELECTRON-GAS - PHOTOLUMINISCENCE FROM IN0.53GA0.47AS INP QUANTUM-WELLS/

Different modulation doped In0.53Ga0.47As/InP quantum wells have been studied by photoluminescence and photoluminescence excitation at varia ble temperature and magnetic field. Clear manifestations of many-body effects as band-gap renormalization, optical Fermi-edge singularities, and shake-up sidebands are observed to depend on the electron concent ration. A correlated evolution of the Fermi-edge singularity and the s hake-up intensities with the filling factor is observed and explained in terms of the screening properties of thr two-dimensional electron g as. The role of the hole mass on the optical spectra is also considere d. These results provide a unified picture of the main effects of elec tron-electron interaction on the magneto-optical properties of the two -dimensional electron gas.