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Quantum Hall effect in asymmetric double quantum well systems

We have experimentally determined the phase diagram of the quantum Hall effect in asymmetric double quantum well heterostructures. The charge redistribution induced by a crossing of the Landau levels of the two-dimensional electron gases is strongly regulated by the electrons in the excited subband. The self-consistency of the potential imposes a reduction in the charge transfer when the layer separation is large. For a range of electron densities beyond the population threshold of the excited subband, subpeaks are generated from the resistance peaks due to the ground subband. The split-off peaks grow larger in amplitude to become comparable with the contribution from the ground subband when the electron density in the excited subband increases. The relocation of the electrons between the subbands leads to a hybridization of the behaviour in each layer. The Hartree potential is found to yield a metastability of the electron state with the assistance of the discrete nature of the density of states in high magnetic fields.