Influence of screening in the magneto-optical properties of a two-dimensional electron gas: Photoluminiscence from ${\mathrm{In}}_{0.53}$${\mathrm{Ga}}_{0.47}$As/InP quantum wells

Different modulation doped ${\mathrm{In}}_{0.53}$${\mathrm{Ga}}_{0.47}$As/InP quantum wells have been studied by photoluminescence and photoluminescence excitation at variable 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 concentration. A correlated evolution of the Fermi-edge singularity and the shake-up intensities with the filling factor is observed and explained in terms of the screening properties of the two-dimensional electron gas. The role of the hole mass on the optical spectra is also considered. These results provide a unified picture of the main effects of electron-electron interaction on the magneto-optical properties of the two-dimensional electron gas.