Magnetoresistance oscillations due to intersubband scattering in a two-dimensional electron system

We show that at intermediate temperatures oscillatory magnetoresistance of the quasi-two dimensional electron System can be dominated by magnetointersubband scattering (MIS). The longitudinal resistance in high carrier concentration Al0.3Ga0.7As/GaAs heterojunctions and pseudomorphic Al0.3Ga0.7As/In0.1Ga0.9As/GaAs quantum wells exhibits magnetoresistance oscillations with Fundamental fields significantly different from the Shubnikov-de Haas and magnetophonon resonance fundamental fields. The subband spacing can be calculated from the measured MIS fundamental field, and good agreement is found between measured and calculated subband spacings.