Elimination of the electron-phonon interaction in superlattices in a quantizing magnetic field

The energy and wave-vector conservation laws impose rigid constraints on the possible electron-phonon interaction processes in a superlattice immersed in a quantized magnetic field directed along its growth axis. If the width of the Landau subband is smaller than the maximum energy of an acoustic phonon in the superlattice, single-phonon intraband scattering becomes impossible for all electron states in the subband considered. Therefor, the phonon contribution to the electron scattering processes can become negligible in superlattices with a large period in the presence of a quantized magnetic field. (C) 1998 American Institute of Physics.