MAGNETOTUNNELING SPECTROSCOPY IN WIDE IN0.53GA0.47AS IN0.52AL0.48AS DOUBLE-QUANTUM WELLS/

Magnetoquantum oscillations in the tunnel current of wide In0.53Ga0.47 As/In0.52Al0.48As double quantum wells have been exploited to trace th e energy levels in the adjacent wells as a function of the applied vol tage. The dominant inelastic scattering mechanism was identified as Ga As-like longitudinal-optical-phonon emission. This powerful spectrosco py probe allows an unambiguous identification of the transmission chan nels responsible for the peaks observed in the current-voltage charact eristics and provides a large number of consistency checks. The obtain ed experimental results can be used to verify the accuracy of self-con sistent simulation programs.