Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 62: Graphene: Applications, Luminescence and Spin Relaxation (HL with O/TT)
O 62.8: Talk
Wednesday, March 18, 2015, 18:30–18:45, ER 270
Spin Relaxation in Graphene — •Frank Ortmann1, Dinh. V. Tuan2, David Soriano2, Sergio O. Valenzuela2,3, and Stephan Roche2,3 — 1Institute for Materials Science and Dresden Center for Computational Materials Science, TU Dresden, Germany — 2ICN2 Barcelona, Spain — 3ICREA, Barcelona, Spain
Spin polarization of electrons in graphene has been under great attention in recent years due to intrinsically small spin-orbit coupling and hyperfine interaction and high carrier mobilities. However, experimental spin-relaxation times are 3-4 orders of magnitude too short compared to theoretical predictions. Such discrepancy, together with contradictory proposals for spin-relaxation mechanisms, triggered a debate about its behavior in clean and/or defective graphene.
We observe an intrinsic spin-dephasing mechanism in graphene that is most strongly impacting the Dirac point, which can be enhanced by the adsorption of heavy ad-atoms.[1] The extracted spin relaxation times (τs) from our simulations show good agreement with experimentally observed energy dependencies of τs.
[1] D. V. Tuan, F. Ortmann et al. Nature Phys. 10, 857 (2014).