HOT MAGNETO-PHONON AND ELECTRO-PHONON RESONANCES IN HETEROSTRUCTURES

When the energy separation of two quantum levels equals the energy of an LO phonon, resonant interaction occurs which leads to an enhancemen t of the scattering rate and consequently to a suppression of the cond uctivity. This effect is called magneto-phonon resonance (MPR) when th e resonant scattering occurs between two Landau levels, and electro-ph onon resonance (EPR) when the scattering occurs between two electrical subbands. In the present paper we discuss both effects in GaAs/AlxGa1 -xAs heterostructures under hot-electron conditions. The influence of the heating of the electrons on the resonant condition and the amplitu de of the effect is studied.