Local Compressibility Measurements of Correlated States in Suspended Bilayer Graphene

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Local Compressibility Measurements of Correlated States in Suspended Bilayer Graphene

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dc.contributor.author Martin, Jens
dc.contributor.author Weitz, R.
dc.contributor.author Feldman, Benjamin Ezekiel
dc.contributor.author Allen, Monica
dc.contributor.author Yacoby, Amir
dc.date.accessioned 2012-01-24T17:55:51Z
dc.date.issued 2010
dc.identifier.citation Martin, Jens, Benjamin Feldman, R. Weitz, Monica Allen, and Amir Yacoby. 2010. Local compressibility measurements of correlated states in suspended bilayer graphene. Physical Review Letters 105(25): 256806. en_US
dc.identifier.issn 1079-7114 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:8013321
dc.description.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 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. en_US
dc.description.sponsorship Physics en_US
dc.language.iso en_US en_US
dc.publisher American Physical Society en_US
dc.relation.isversionof doi:10.1103/PhysRevLett.105.256806 en_US
dc.relation.hasversion http://arxiv.org/abs/1009.2069v1 en_US
dash.license OAP
dc.subject mesoscale and nanoscale physics en_US
dc.title Local Compressibility Measurements of Correlated States in Suspended Bilayer Graphene en_US
dc.type Journal Article en_US
dc.description.version Author's Original en_US
dc.relation.journal Physical Review Letters en_US
dash.depositing.author Yacoby, Amir
dc.date.available 2012-01-24T17:55:51Z

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