Influence of Impurity Spin Dynamics on Quantum Transport in Epitaxial Graphene

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 analys...

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Published inPhysical review letters Vol. 115; no. 10; p. 106602
Main Authors Lara-Avila, Samuel, Kubatkin, Sergey, Kashuba, Oleksiy, Folk, Joshua A, Lüscher, Silvia, Yakimova, Rositza, Janssen, T J B M, Tzalenchuk, Alexander, Fal'ko, Vladimir
Format Journal Article
LanguageEnglish
Published United States 04.09.2015
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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.
AbstractList 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.
Author Folk, Joshua A
Janssen, T J B M
Fal'ko, Vladimir
Lara-Avila, Samuel
Yakimova, Rositza
Lüscher, Silvia
Tzalenchuk, Alexander
Kubatkin, Sergey
Kashuba, Oleksiy
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  givenname: Sergey
  surname: Kubatkin
  fullname: Kubatkin, Sergey
  organization: Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg S-412 96, Sweden
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  organization: Institute of Theoretical Physics, Technische Universität Dresden, Dresden 01062, Germany
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  givenname: Joshua A
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  organization: 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
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  organization: National Physical Laboratory, Teddington TW11 0LW, United Kingdom
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  givenname: Alexander
  surname: Tzalenchuk
  fullname: Tzalenchuk, Alexander
  organization: National Physical Laboratory, Teddington TW11 0LW, United Kingdom and Royal Holloway, University of London, Egham TW20 0EX, United Kingdom
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Snippet Experimental evidence from both spin-valve and quantum transport measurements points towards unexpectedly fast spin relaxation in graphene. We report...
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Title Influence of Impurity Spin Dynamics on Quantum Transport in Epitaxial Graphene
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