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We have studied the transport properties of a large graphene double quantumdot under the influence of background disorder potential and magnetic field. Atlow temperatures, the evolution of the charge-stability diagram as a functionof B-field is investigated up to 10 Tesla. Our results indicate that thecharging energy of quantum dot is reduced, and hence the size of the dotincreases, at high magnetic field. We provide an explanation of our resultsusing a tight-binding model, which describes the charge redistribution in adisordered graphene quantum dot via the formation of Landau levels and edgestates. Our model suggests that the tunnel barriers separating differentelectron/hole puddles in a dot become transparent at high B-fields, resultingin the charge delocalization and reduced charging energy observedexperimentally.

Magnetic field induced charge redistribution in disordered graphene double quantum dots