Spin hall effect and origins of nonlocal Resistance in adatom-decorated graphene
Dinh, Van Tuan (Institut Català de Nanociència i Nanotecnologia)
Marmolejo Tejada, J. M. (University of Delaware. Department of Physics and Astronomy)
Waintal, Xavier (Université Grenoble Alpes)
Nikolić, B. K. (University of Delaware. Department of Physics and Astronomy)
Valenzuela, Sergio O. (Institut Català de Nanociència i Nanotecnologia)
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)

Date:	2016
Abstract:	Recent experiments reporting an unexpectedly large spin Hall effect (SHE) in graphene decorated with adatoms have raised a fierce controversy. We apply numerically exact Kubo and Landauer-Büttiker formulas to realistic models of gold-decorated disordered graphene (including adatom clustering) to obtain the spin Hall conductivity and spin Hall angle, as well as the nonlocal resistance as a quantity accessible to experiments. Large spin Hall angles of ∼0. 1 are obtained at zero temperature, but their dependence on adatom clustering differs from the predictions of semiclassical transport theories. Furthermore, we find multiple background contributions to the nonlocal resistance, some of which are unrelated to the SHE or any other spin-dependent origin, as well as a strong suppression of the SHE at room temperature. This motivates us to design a multiterminal graphene geometry which suppresses these background contributions and could, therefore, quantify the upper limit for spin-current generation in two-dimensional materials.
Grants:	European Commission 696656 European Commission 308023 Ministerio de Economía y Competitividad FIS2015-67767-P Ministerio de Economía y Competitividad SEV2013-0295
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Disordered graphene ; Multi terminals ; Realistic model ; Semiclassical transport ; Spin currents ; Spin hall conductivity ; Two-dimensional materials ; Zero temperatures
Published in:	Physical review letters, Vol. 117, issue 17 (Oct. 2016) , p. 176602, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.117.176602

Postprint 7 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