MAGNETORESISTANCE OSCILLATIONS DUE TO INTERSUBBAND SCATTERING IN A 2-DIMENSIONAL ELECTRON-SYSTEM

We show that at intermediate temperatures oscillatory magnetoresistanc e of the quasi-two dimensional electron System can be dominated by mag netointersubband scattering (MIS). The longitudinal resistance in high carrier concentration Al0.3Ga0.7As/GaAs heterojunctions and pseudomor phic Al0.3Ga0.7As/In0.1Ga0.9As/GaAs quantum wells exhibits magnetoresi stance oscillations with Fundamental fields significantly different fr om the Shubnikov-de Haas and magnetophonon resonance fundamental field s. The subband spacing can be calculated from the measured MIS fundame ntal field, and good agreement is found between measured and calculate d subband spacings.