Weak-localization magnetoresistance and valley symmetry in graphene

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 inte...

Full description

Saved in:
Bibliographic Details
Published in:Physical review letters 2006-10, Vol.97 (14), p.146805-146805, Article 146805
Main Authors: McCann, E, Kechedzhi, K, Fal'ko, Vladimir I, Suzuura, H, Ando, T, Altshuler, B L
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.97.146805