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The proximity of a transition metal dichalcogenide (TMD) to graphene imprintsa rich spin texture in graphene and complements its high quality charge/spintransport by inducing spin-orbit coupling (SOC). Rashba and valley-Zeeman SOCsare the origin of charge-to-spin conversion mechanisms such as Rashba-Edelsteineffect (REE) and spin Hall effect (SHE). In this work, we experimentallydemonstrate for the first time charge-to-spin conversion due to the REE in amonolayer WS2-graphene van der Waals heterostructure. We measure thecurrent-induced spin polarization up to room temperature and control it by agate electric field. Our observation of the REE and inverse of the effect(IREE) is accompanied by the SHE which we discriminate by symmetry-resolvedspin precession under oblique magnetic fields. These measurements also allowfor quantification of the efficiencies of charge-to-spin conversion by each ofthe two effects. These findings are a clear indication of induced Rashba andvalley-Zeeman SOC in graphene that lead to generation of spin accumulation andspin current without using ferromagnetic electrodes. These realizations haveconsiderable significance for spintronic applications, providing accessibleroutes towards all-electrical spin generation and manipulation intwo-dimensional materials.

Charge-to-Spin Conversion by the Rashba-Edelstein Effect in 2D van der Waals Heterostructures up to Room Temperature