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 in | Physical review letters Vol. 115; no. 10; p. 106602 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
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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. |
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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 |
Author_xml | – sequence: 1 givenname: Samuel surname: Lara-Avila fullname: Lara-Avila, Samuel organization: Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg S-412 96, Sweden – sequence: 2 givenname: Sergey surname: Kubatkin fullname: Kubatkin, Sergey organization: Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg S-412 96, Sweden – sequence: 3 givenname: Oleksiy surname: Kashuba fullname: Kashuba, Oleksiy organization: Institute of Theoretical Physics, Technische Universität Dresden, Dresden 01062, Germany – sequence: 4 givenname: Joshua A surname: Folk fullname: Folk, Joshua A 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 – sequence: 5 givenname: Silvia surname: Lüscher fullname: Lüscher, Silvia 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 – sequence: 6 givenname: Rositza surname: Yakimova fullname: Yakimova, Rositza organization: Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping S-581 83, Sweden – sequence: 7 givenname: T J B M surname: Janssen fullname: Janssen, T J B M organization: National Physical Laboratory, Teddington TW11 0LW, United Kingdom – sequence: 8 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 – sequence: 9 givenname: Vladimir surname: Fal'ko fullname: Fal'ko, Vladimir organization: Physics Department, Lancaster University, Lancaster LA1 4YB, United Kingdom |
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