Electric field effects on intersubband transitions in quantum well structures

We report on a Raman scattering study of the electric-field dependence of c0 --> c1 intersubband transitions of electrons in a 264 A GaAs- Al0.3Ga0.7As quantum-well structure. The measured Stark shifts are in very good agreement with theoretical predictions. The intensity of the intersubband peak increases rapidly with applied field due to parity-mixing. In contrast to the enhanced broadening shown by excitation resonances, the width of c0 --> c1 is nearly independent of the field. This feature is attributed to effects of structural disorder.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/26980/1/0000547.pd