FIG.33 (a) Magnetoresistance at 2.4

FIG.33 (a) Magnetoresistance at 2.4 K of a narrow GaAs- AlGaAs channel (as in FIG.28). The arrows indicate magnetic field values assigned to the depopulation of magnetoelectric subbands. (b) Subband index n ≡ N − 1 versus inverse magnetic field (crosses). The dashed line interpolates between theoretical points for a parabolic confining potential (circles). The electrostatic confinement causes deviations from a linear dependence of n on B−1. Taken from K.-F. Berggren et al., Phys. Rev. B 37, 10118 (1988).