Room-temperature spin hall effect in graphene/MoS 2 van der Waals heterostructures
Abstract
Graphene is an excellent material for long-distance spin transport but allows little spin manipulation. Transition-metal dichalcogenides imprint their strong spin-orbit coupling into graphene via the proximity effect, and it has been predicted that efficient spin-to-charge conversion due to spin Hall and Rashba-Edelstein effects could be achieved. Here, by combining Hall probes with ferromagnetic electrodes, we unambiguously demonstrate experimentally the spin Hall effect in graphene induced by MoS2 proximity and for varying temperatures up to room temperature. The fact that spin transport and the spin Hall effect occur in different parts of the same material gives rise to a hitherto unreported efficiency for the spin-to-charge voltage output. Additionally, for a single graphene/MoS2 heterostructure-based device, we evidence a superimposed spin-to-charge current conversion that can be indistinguishably associated with either the proximity-induced Rashba-Edelstein effect in graphene or the spin Hall effect in MoS2. By a comparison of our results to theoretical calculations, the latter scenario is found to be the most plausible one. Our findings pave the way toward the combination of spin information transport and spin-to-charge conversion in two-dimensional materials, opening exciting opportunities in a variety of future spintronic applications. ; This work is supported by the Spanish MINECO under the Maria de Maeztu Units of Excellence Programme (MDM-2016-0618) and under projects MAT2015-65159-R and MAT2017-82071-ERC and by the European Union H2020 under the Marie Curie Actions (QUESTECH). The work in ICN2 is supported by Spanish MINECO under Severo Ochoa program (Grant No. Sev-2017-0706). S.R. and J.H.G. acknowledge support from the European Union Seventh Framework Programme under grant agreement no. 785219 Graphene Flagship and the computational resources from PRACE and the Barcelona Supercomputing Center (project no. 2015133194). M. V. acknowledges funding received from la Caixa foundation.
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