Abstract
Magnetotransport measurements were performed in two widely separated double quantumwell systems with different starting disorders. In the weak magnetic field regime, acrossover from negative to positive magnetoresistance in the longitudinal resistivity wasobserved in the system with weak disorder when the electron densities in the neighboringwells were significantly unbalanced. The crossover was found to be the resultof the exchange-energy-assisted interactions between the electrons occupyingthe lowest subbands in the neighboring wells. In the case of the system withstrong disorder short range scattering dominated the scattering process and nosuch transition in longitudinal resistivity in the low magnetic field regime wasobserved. However, at high magnetic fields, sharp peaks were observed in the Hallresistance due to the interaction between the edge states in the quantum Hall regime.
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