Influence of Impurity Spin Dynamics on Quantum Transport in Epitaxial Graphene

Lara-Avila, Samuel and Kubatkin, Sergey and Kashuba, Oleksiy Mykolayovych and Folk, Joshua and Luscher, Silvia and Yakimova, Rositza and Janssen, T. J. B. M. and Tzalenchuk, Alexander and Falko, Vladimir (2015) Influence of Impurity Spin Dynamics on Quantum Transport in Epitaxial Graphene. Physical review letters, 115 (10). ISSN 1079-7114

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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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Journal Article
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Physical review letters
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23 Aug 2016 08:16
Last Modified:
21 Sep 2023 02:06