Spin transport in hydrogenated graphene
Soriano, David (Institut Català de Nanociència i Nanotecnologia)
Dinh, Van Tuan (Institut Català de Nanociència i Nanotecnologia)
Dubois, Simon M. M. (Université Catholique de Louvain. Institute of Condensed Matter and Nanosciences)
Gmitra, Martin (University of Regensburg)
Cummings, Aron (Institut Català de Nanociència i Nanotecnologia)
Kochan, Denis (University of Regensburg)
Ortmann, Frank (Technische Universität Dresden)
Charlier, Jean Christophe (Université Catholique de Louvain. Institute of Condensed Matter and Nanosciences)
Fabian, Jaroslav (Universität Regensburg)
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)

Date:	2015
Abstract:	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.
Grants:	European Commission 604391 Ministerio de Economía y Competitividad MAT2012-33911 Ministerio de Economía y Competitividad SEV2013-0295
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Published in:	2D materials, Vol. 2, Núm. 2 (June 2015) , art. 22002, ISSN 2053-1583

DOI: 10.1088/2053-1583/2/2/022002

Postprint 11 p, 562.6 KB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles