Effects of localized phonon modes on magnetotunneling spectra in double-barrier structures.

Abstract

The effects of localized phonon modes on the low-temperature current-voltage curves of GaAs/AlAs double-barrier resonant-tunneling structures have been calculated in the presence of large magnetic fields parallel to the applied electric field. The applied magnetic field sharpens and increases the height of the phonon-assisted-tunneling peaks in agreement with experimental data. Computed magnetotunneling spectra reveal systematic deviations from a simple fan structure---also observed experimentally---which are attributed here to oscillations of the emitter Fermi level with the magnetic field.