Spin transport in hydrogenated graphene

David Soriano, Dinh Van Tuan, Simon M.M. Dubois, Martin Gmitra, Aron W. Cummings, Denis Kochan, Frank Ortmann, Jean Christophe Charlier, Jaroslav Fabian, Stephan Roche

    Research output: Contribution to journalReview articleResearchpeer-review

    49 Citations (Scopus)

    Abstract

    © 2015 IOP Publishing Ltd. In this review we discuss the multifaceted problem of spin transport in hydrogenated graphene from a theoretical perspective. The current experimental findings suggest that hydrogenation can either increase or decrease spin lifetimes, which calls for clarification.We first discuss the spin-orbit coupling induced by local σ-π re-hybridization and sp3 C-Hdefect formation togetherwith the formation of a local magnetic moment. First-principles calculations of hydrogenated graphene unravel the strong interplay of spin-orbit and exchange couplings. The concept of magnetic scattering resonances, recently introduced by Kochan et al (2014 Phys. Rev. Lett. 112 116602) is revisited by describing the local magnetism through the self-consistent Hubbard model in the mean field approximation in the dilute limit, while spin relaxation lengths and transport times are computed using an efficient real space orderNwavepacket propagation method. Typical spin lifetimes on the order of 1 ns are obtained for 1 ppm of hydrogen impurities (corresponding to a transport time of about 50 ps), and the scaling of spin lifetimes with impurity density is described by the Elliott-Yafet mechanism. This reinforces the statement that local defect-induced magnetism can be at the origin of the substantial spin polarization loss in the clean graphene limit.
    Original languageEnglish
    Article number022002
    Journal2D materials
    Volume2
    Issue number2
    DOIs
    Publication statusPublished - 27 May 2015

    Keywords

    • Hydrogenated graphene
    • Magnetism
    • Spin transport

    Fingerprint

    Dive into the research topics of 'Spin transport in hydrogenated graphene'. Together they form a unique fingerprint.

    Cite this