Phonon resonances in optical spectra of donors in quantum wells

An influence of electron-phonon coupling and electron confinement on optical spectra is studied for donors in semiconductor quantum wells. A binding and 1s-2p transition energies have been calculated by the optimized canonical transformation method for GaAs/AlGaAs, CdTe/CdZnTe, and CdF(2)/CaF(2) quantum wells. We have found that - in the quantum wells made from the ionic semiconductors - the 1s-2p transition energy exceeds the LO-phonon energy and the phonon resonances can appear in the optical spectra of donors. We have estimated the parameters of quantum wells, for which the phonon resonances can be detected in the absence of external magnetic field. (C) 1999 Elsevier Science B.V. All rights reserved.