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O: Fachverband Oberflächenphysik

O 25: Symposium Spin Properties of Graphene (HL jointly with DS, MA, O, TT)

O 25.4: Hauptvortrag

Dienstag, 1. April 2014, 11:15–11:45, HSZ 02

Defect-Mediated Spin Relaxation and Dephasing in Graphene — Mark Lundeberg^1,2, Silvia Folk¹, and •Joshua Folk¹ — ¹University of British Columbia, Vancouver, Canada — ²Institute of Photonic Sciences, Barcelona, Spain

This talk will describe a series of transport measurements that disentangle mechanisms of spin and orbital phase relaxation in graphene. The measurements are based on well-known quantum interference phenomena–weak localization and universal conductance fluctuations. We show that a careful analysis of the in-plane magnetic field and temperature dependences of these effects can separately quantify spin-orbit and magnetic scattering rates; this technique works especially well in graphene due to its single-atom thickness. Spin relaxation in exfoliated graphene on SiO₂ is found to be dominated by magnetic scattering (scattering off of magnetic defects), with a smaller contribution from spin-orbit interaction. A similar measurement performed in graphene on SiC suggests that both magnetic scattering and spin-orbit interaction are a factor of 10 stronger than in exfoliated graphene.