title: Influence of Impurity Spin Dynamics on Quantum Transport in Epitaxial Graphene.
abstract: Experimental evidence from both spin-valve and quantum transport measurements points towards unexpectedly fast spin relaxation in graphene. We report magnetotransport studies of epitaxial graphene on SiC in a vector magnetic field showing that spin relaxation, detected using weak-localization analysis, is suppressed by an in-plane magnetic field B(∥), and thereby proving that it is caused at least in part by spinful scatterers. A nonmonotonic dependence of the effective decoherence rate on B(∥) reveals the intricate role of the scatterers' spin dynamics in forming the interference correction to the conductivity, an effect that has gone unnoticed in earlier weak localization studies.
authors.affiliation: Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg S-412 96, Sweden.
authors.forename: Samuel
authors.initials: S
authors.lastname: Lara-Avila
authors.affiliation: Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg S-412 96, Sweden.
authors.forename: Sergey
authors.initials: S
authors.lastname: Kubatkin
authors.affiliation: Institute of Theoretical Physics, Technische Universität Dresden, Dresden 01062, Germany.
authors.forename: Oleksiy
authors.initials: O
authors.lastname: Kashuba
authors.affiliation: Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada and Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: Joshua A
authors.initials: JA
authors.lastname: Folk
authors.affiliation: Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada and Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
authors.forename: Silvia
authors.initials: S
authors.lastname: Lüscher
authors.affiliation: Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping S-581 83, Sweden.
authors.forename: Rositza
authors.initials: R
authors.lastname: Yakimova
authors.affiliation: National Physical Laboratory, Teddington TW11 0LW, United Kingdom.
authors.forename: T J B M
authors.initials: TJ
authors.lastname: Janssen
authors.affiliation: National Physical Laboratory, Teddington TW11 0LW, United Kingdom and Royal Holloway, University of London, Egham TW20 0EX, United Kingdom.
authors.forename: Alexander
authors.initials: A
authors.lastname: Tzalenchuk
authors.affiliation: Physics Department, Lancaster University, Lancaster LA1 4YB, United Kingdom.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Fal'ko