Multiple quantum phases in graphene with enhanced spin-orbit coupling : from the quantum spin hall regime to the spin hall effect and a robust metallic state
Cresti, Alessandro (IMEP-LAHC)
Dinh, Van Tuan (Universitat Autònoma de Barcelona. Departament de Física)
Soriano, David (Institut Català de Nanociència i Nanotecnologia)
Cummings, Aron (Institut Català de Nanociència i Nanotecnologia)
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)

Date:	2014
Abstract:	We report an intriguing transition from the quantum spin Hall phase to the spin Hall effect upon segregation of thallium adatoms adsorbed onto a graphene surface. Landauer-Büttiker and Kubo-Greenwood simulations are used to access both edge and bulk transport physics in disordered thallium-functionalized graphene systems of realistic sizes. Our findings not only quantify the detrimental effects of adatom clustering in the formation of the topological state, but also provide evidence for the emergence of spin accumulation at opposite sample edges driven by spin-dependent scattering induced by thallium islands, which eventually results in a minimum bulk conductivity ∼4e2/h, insensitive to localization effects.
Grants:	European Commission 604391 Ministerio de Economía y Competitividad SEV-2013-0295 Ministerio de Economía y Competitividad MAT2012-33911
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Bulk conductivities ; Functionalized graphene ; Localization effect ; Quantum spin Hall phase ; Quantum spin halls ; Spin dependent scattering ; Spin-accumulations ; Spin-orbit couplings
Published in:	Physical review letters, Vol. 113, issue 24 (Dec. 2014) , art. 246603, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.113.246603

Postprint 12 p, 2.3 MB

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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