Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-09-10
Phys. Rev. Lett. 105, 256806 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, including 4 figures and supplementary materials
Scientific paper
10.1103/PhysRevLett.105.256806
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 v = 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 v = 0, 1 and 2, and find that they scale linearly with magnetic field, yet another manifestation of the strong Coulomb interactions in bilayer graphene.
Allen Monica T.
Feldman Benjamin E.
Martin Jens
Weitz Thomas R.
Yacoby Amir
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