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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Title: Local Compressibility Measurements of Correlated States in Suspended Bilayer Graphene
Author: Martin, Jens; Weitz, R.; Feldman, Benjamin Ezekiel; Allen, Monica; Yacoby, Amir

Note: Order does not necessarily reflect citation order of authors.

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.
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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.
Published Version: doi:10.1103/PhysRevLett.105.256806
Other Sources: http://arxiv.org/abs/1009.2069v1
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:8013321

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  • FAS Scholarly Articles [7220]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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