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  • Title: Local compressibility measurements of correlated states in suspended bilayer graphene.
    Author: Martin J, Feldman BE, Weitz RT, Allen MT, Yacoby A.
    Journal: Phys Rev Lett; 2010 Dec 17; 105(25):256806. PubMed ID: 21231612.
    Abstract:
    Bilayer graphene has attracted considerable interest due to the important role played by many-body effects, particularly at low energies. Here we report local compressibility measurements of a suspended graphene bilayer. We find that the energy gaps at filling factors ν= ± 4 do not vanish at low fields, but instead merge into an incompressible region near the charge neutrality point at zero electric and magnetic field. These results indicate the existence of a zero-field ordered state and are consistent with the formation of either an anomalous quantum Hall state or a nematic phase with broken rotational symmetry. At higher fields, we measure the intrinsic energy gaps of broken-symmetry states at ν=0, ± 1, and ± 2, and find that they scale linearly with magnetic field, yet another manifestation of the strong Coulomb interactions in bilayer graphene.
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