Zero-phonon and dipole Gamma-X electron transitions in GaAs/AlAs quantum-well heterostructures in a longitudinal electric field

The probabilities of zero-phonon and dipole electron transitions between th e Gamma and X subbands in a GaAs/AlAs quantum-well heterostructure subjecte d to a high longitudinal electric field are calculated. It is shown that th e electric field significantly affects the probabilities of both the zero-p honon and the direct dipole Gamma-X transitions. In addition, the electric field changes the spectral dependence of the Gamma-X intersubband light-abs orption coefficient; i.e., an intersubband analogue of the Franz-Keldysh ef fect takes place. (C) 2000 MAIK "Nauka/Interperiodica".