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 |
Published |
United States
04.09.2015
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Online Access | Get more information |
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Summary: | 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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ISSN: | 1079-7114 |
DOI: | 10.1103/PhysRevLett.115.106602 |