Resonant magnetoexcitons and the Fermi-edge singularity in a magnetic field

The effect of the magnetic field B on the Fermi-edge singularity in optical properties of asymmetric quantum wells is investigated using a two-subband Mahan–Nozrigaeres–De Dominicis Hamiltonian. The emission spectrum for carriers in the lowest subband is strongly enhanced by excitonic transitions involving higher subbands. The modulation of the emission spectrum is almost periodic in 1/B.