We studied the electronic transport properties of monolayer and bilayer graphene in top-gated geometries. Monolayer and bilayer graphene were epitaxially grown by thermal decomposition of SiC. The half-integer quantum Hall effect under the gated environment was observed in monolayer graphene devices. The mobility of the monolayer and bilayer graphene devices showed distinct characteristics as a function of carrier density, which reflect their electronic structures. Strong temperature dependence at the charge neutrality point was observed in bilayer graphene devices, suggesting band gap opening.
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