TEMPERATURE EFFECTS ON FERMI-EDGE ABSORPTION-SPECTRA

We present an extension to finite temperatures of the Mahari-Nozieres- De Dominicis framework to study both the many-body and temperature eff ects in absorption spectra of doped semiconductors. The method is used to study magnetoabsorption spectra of modulation-doped quantum wells with a weak periodic lateral modulation. In our scheme, temperature ef fects in the electronic part of the correlation function characterize the absorption spectra. We treat the valence-hole contribution to the absorption correlation function in second-order perturbation. The time -dependent hole self-energy to second order, F-2(t), and the creation rate of a conduction electron-hole pair R(omega), are carefully discus sed. The temperature dependence of such quantities as well as their in fluence on the absorption spectra is analyzed. As a practical applicat ion, we investigate the effect of the hole position on the absorption spectra.