Field-induced 2D-3D carrier transfer and phonon emission in delta -doped GaAs

Investigations of the differential conductivity and time-of-flight spectra of phonons emitted by hot electrons were performed in Si delta -doped GaAs. Together with a Green function balance equation method for numerical simulations, carrier heating in an electrical field is convincingly described. The results emphasize the importance of carrier transfer from the confined to the extended states and the role of phonon emission.