Abstract
We report magnetotransport experiments in high carrier density GaAs/Ga 0.8In 0.2As/Ga 0.75Al 0.25As heterostructures in magnetic fields up to 50 T. At the lowest electron densities the quantized Hall effect is observed, with one subband occupied. As the density is increased, features indicating the population of the second subband emerge. Further increase of the electron density results in drastic changes in the transport coefficients ϱ xx and ϱ xy , especially at fields above 30 T. The data cannot be explained by standard models for two-band conduction or magnetic freeze-out.
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