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Weak localisation magnetoresistance and valley symmetry in graphene.

McCann, Edward and Kechedzhi, K. and Fal’ko, Vladimir I. and Suzuura, H. and Ando, T. and Altshuler, B. L. (2006) Weak localisation magnetoresistance and valley symmetry in graphene. Physical Review Letters, 97 (14). p. 146805. ISSN 1079-7114

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    Abstract

    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.

    Item Type: Article
    Journal or Publication Title: Physical Review Letters
    Additional Information: ©2006 The American Physical Society
    Subjects: Q Science > QC Physics
    Departments: Faculty of Science and Technology > Physics
    ID Code: 30825
    Deposited By: Dr Edward McCann
    Deposited On: 08 Dec 2009 09:17
    Refereed?: Yes
    Published?: Published
    Last Modified: 26 Jul 2012 16:50
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/30825

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