Giant spin lifetime anisotropy in graphene induced by proximity effects
Cummings, Aron (Institut Català de Nanociència i Nanotecnologia)
Garcia, José H. (Institut Català de Nanociència i Nanotecnologia)
Fabian, Jaroslav (Universität Regensburg. Insitute for Theoretical Physics)
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)

Data:	2017
Resum:	We report on fundamental aspects of spin dynamics in heterostructures of graphene and transition metal dichalcogenides (TMDCs). By using realistic models derived from first principles we compute the spin lifetime anisotropy, defined as the ratio of lifetimes for spins pointing out of the graphene plane to those pointing in the plane. We find that the anisotropy can reach values of tens to hundreds, which is unprecedented for typical 2D systems with spin-orbit coupling and indicates a qualitatively new regime of spin relaxation. This behavior is mediated by spin-valley locking, which is strongly imprinted onto graphene by TMDCs. Our results indicate that this giant spin lifetime anisotropy can serve as an experimental signature of materials with strong spin-valley locking, including graphene-TMDC heterostructures and TMDCs themselves. Additionally, materials with giant spin lifetime anisotropy can provide an exciting platform for manipulating the valley and spin degrees of freedom, and for designing novel spintronic devices.
Ajuts:	European Commission 696656 Ministerio de Economía y Competitividad FIS2015-67767-P Ministerio de Economía y Competitividad SEV-2013-0295 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014 SGR 58
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	First principles ; Proximity effects ; Realistic model ; Spin degrees of freedom ; Spin relaxation ; Spin-orbit couplings ; Spintronic device ; Transition metal dichalcogenides
Publicat a:	Physical review letters, Vol. 119 issue 20 (Nov. 2017) , p. 206601, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.119.206601

Postprint 9 p, 997.0 KB

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