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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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: Journal Article
Journal or Publication Title: Physical review letters
Additional Information: ©2006 The American Physical Society
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/qc
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: 19 Feb 2020 01:11
URI: https://eprints.lancs.ac.uk/id/eprint/30825

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