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Weak localisation magnetoresistance and valley symmetry in graphene.

Research output: Contribution to journalJournal article

Published

Journal publication date6/10/2006
JournalPhysical Review Letters
Journal number14
Volume97
Pages146805
Original languageEnglish

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.

Bibliographic note

©2006 The American Physical Society