Theory of spin-orbit induced spin relaxation in functionalized graphene

Abstract

We perform a comparative study of the spin relaxation by spin-orbit coupling induced from adatoms (hydrogen and fluorine) in graphene. Two methods are applied, giving consistent results: a full quantum transport simulation of a graphene nanoribbon, and a T-matrix calculation using Green's functions for a single adatom in graphene. For hydrogenated graphene the dominant spin-orbit term for spin relaxation is PIA, the hitherto neglected interaction due to pseudospin inversion asymmetry. In contrast, in fluorinated graphene PIA and Rashba couplings destructively interfere, reducing the total spin relaxation rate. In this case we also predict a strong deviation from the expected 2:1 spin relaxation anisotropy for out- and in-plane spin orientations. Our findings should be useful to benchmark spin relaxation and weak localization experiments of functionalized graphene.

5 pages, 3 figures, Suppl. Material on request

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• Efficient quantum transport simulation for bulk graphene heterojunctions

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• Resonant scattering due to adatoms in graphene: top, bridge, and hollow position
• Absence of a giant spin Hall effect in plasma-hydrogenated graphene
• Spin-orbit coupling in methyl functionalized graphene
• Spin Manipulation in Graphene by Chemically-Induced Sublattice Pseudospin Polarization
• Magnetotransport signatures of the proximity exchange and spin-orbit couplings in graphene
• Crossover to the Anomalous Quantum Regime in the Extrinsic Spin Hall Effect of Graphene
• Modeling the Oblique Spin Precession in Lateral Spin Valves for Accurate Determination of Spin Lifetime Anisotropy: Effect of Finite Contact Resistance and Channel Length
• Spin relaxation in fluorinated single and bilayer graphene
• Ab initio modelling of spin relaxation lengths in disordered graphene nanoribbons†
• Spin relaxation in disordered graphene: Interplay between puddles and defect-induced magnetism
• Breakdown of the Hebel-Slichter effect in superconducting graphene due to the emergence of Yu-Shiba-Rusinov states at magnetic resonant scatterers
• Interplay of resonant states and Landau levels in functionalized graphene
• Spin relaxation, Josephson effect and Yu-Shiba-Rusinov states in superconducting bilayer graphene