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

Web of Science: 36 cites, Scopus: 37 cites, Google Scholar: cites,

(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)

Data:	2014
Resum:	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.
Ajuts:	European Commission 604391 Ministerio de Economía y Competitividad SEV-2013-0295 Ministerio de Economía y Competitividad MAT2012-33911
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Bulk conductivities ; Functionalized graphene ; Localization effect ; Quantum spin Hall phase ; Quantum spin halls ; Spin dependent scattering ; Spin-accumulations ; Spin-orbit couplings
Publicat a:	Physical review letters, Vol. 113, issue 24 (Dec. 2014) , art. 246603, ISSN 1079-7114

Postprint
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Registre creat el 2020-09-14, darrera modificació el 2022-02-06