Abstract
We report on Hall effect measurements in 1000-4000 Åwide AlxGax-1As parabolic wells with quasi-two-dimensional electrons and holes in the presence of a perpendicular magnetic field. Above a critical magnetic field B > 3T, the Hall resistance is found to increase when temperature decreases. We attribute such an enhanced Hall slope to the variation of the carrier density. The Hartree and exchange-correlation terms produce a strong variation of the potential well shap: the width of the electronic and hole slabs shrinks as magnetic field increases, which in turn leads to a charge redistribution between the well and impurity layer.
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