2006/04/30 by E. McCann, Edward McCann, K. Kechedzhi +8 · 24 citations
Economics, Econometrics and Finance · Materials Science · Physics and Astronomy · Social Sciences · #Diverse academic and cultural studies #Educational and Social Studies #Graphene research and applications #Italian Social Issues and Migration #Quantum and electron transport phenomena #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevlett.97.146805
published as Phys. Rev. Lett. 97, 146805 (2006) · Phys. Rev. Lett. 97, 146805 (2006)
arxiv created 2006/10/17 · arxiv updated 2009/12/01 · openalex publication_date 2010/01/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/04/28
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.