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      Weak-localization magnetoresistance and valley symmetry in graphene.

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          Abstract

          Because of the chiral nature of electrons in a monolayer of graphite (graphene) one can expect weak antilocalization and a positive weak-field magnetoresistance in it. However, trigonal warping (which breaks p-->-p symmetry of the Fermi line in each valley) suppresses antilocalization, while intervalley scattering due to atomically sharp scatterers in a realistic graphene sheet or by edges in a narrow wire tends to restore conventional negative magnetoresistance. We show this by evaluating the dependence of the magnetoresistance of graphene on relaxation rates associated with various possible ways of breaking a "hidden" valley symmetry of the system.

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          Author and article information

          Journal
          Phys Rev Lett
          Physical review letters
          American Physical Society (APS)
          0031-9007
          0031-9007
          Oct 06 2006
          : 97
          : 14
          Affiliations
          [1 ] Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom.
          Article
          10.1103/PhysRevLett.97.146805
          17155283
          730d5c9a-28eb-4a5e-9117-aa4006a7105a

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