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Weak localisation magnetoresistance and valley symmetry in graphene.

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<mark>Journal publication date</mark>6/10/2006
<mark>Journal</mark>Physical review letters
Issue number14
Pages (from-to)146805
Publication StatusPublished
<mark>Original language</mark>English


Due to the chiral nature of electrons in a monolayer of graphite (graphene) one can expect weak antilocalisation and a positive weak-field magnetoresistance in it. However, trigonal warping (which breaks p to −p symmetry of the Fermi line in each valley) suppresses antilocalisation, while inter-valley 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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©2006 The American Physical Society