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VOLUME 55 (1992) | ISSUE 11 | PAGE 657
Anomalies in the magnetoresistance of 2D electrons during the filling of the second quantum-size subband in an AlGaAs-GaAs heterojunction: intersubband scattering
Oscillations in the magnetoresistance of electrons of the upper and lower quantum-size subbands are identified. The peak values of the conductivity of the upper subband are well above the predictions of the Ando theory, although the peak values of the conductivity of the lower subband are in all cases smaller than the predictions of this theory by a factor of several units. The Landau levels of the lower subband broaden as the parallel component of the magnetic field is strengthened. Nodes occur in the Shubnikov-de Haas oscillations when delocalized states of the different subbands coincide. The results found here are linked with intersubband scattering.