Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.256806
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Funding
- U. S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0001819]
- DOE SCGF
- U. S. Office of Naval Research Multi University Research Initiative (MURI) on Graphene Advanced Terahertz Engineering (GATE) at MIT
- Harvard and Boston University
- Harvard's NSEC under National Science Foundation [PHY-0646094]
- Alexander von Humbolt Foundation
- National Science Foundation [ECS-0335765]
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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 nu = +/- 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 nu = 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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