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We study the magnetotransport properties of dual-gated graphene bilayers, inwhich the total density and layer density imbalance are independentlycontrolled. As the bilayer is imbalanced we observe the emergence of a quantumHall state (QHS) at filling factor $\nu=0$ evinced by a plateau in the Hallconductivity, consistent with the opening of a gap between the electron andhole bands. By varying the layer density imbalance at fixed total density, weobserve a suppression of the QHS at filling factors $\nu=8$ and $\nu=12$ whenthe layer densities are balanced, an observation at variance with theoreticalexpectations in the absence of electron-electron interaction and disorder.

Quantum Hall effect in dual-gated graphene bilayers with tunable layer density imbalance