Twist Angle Controlled Collinear Edelstein Effect in van der Waals Heterostructures

Abstract

The generation of spatially homogeneous spin polarization by application of electric current is a fundamental manifestation of symmetry-breaking spin--orbit coupling (SOC) in solid-state systems, which underpins a wide range of spintronic applications. Here, we show theoretically that twisted van der Waals heterostructures with proximity-induced SOC are candidates par excellence to realize exotic spin-charge transport phenomena due to their highly tunable momentum-space spin textures. Specifically, we predict that graphene/group-VI dichalcogenide bilayers support room temperature spin--current responses that can be manipulated via twist-angle control. For critical twist angles, the non-equilibrium spin density is pinned parallel to the applied current. This effect is robust against twist-angle disorder, with graphene/${\text{WSe}}_2$ possessing a critical angle (purely collinear response) of ${\theta }_c\simeq 14^{\circ }$. A simple electrical detection scheme to isolate the collinear Edelstein effect is proposed.

12 pages, 6 figures, includes supplemental material. Accepted version in Physical Review B Letters

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Cited by in corpus (5)

• Charge-to-spin conversion in twisted graphene/WSe${}_2$ heterostructures
• Unconventional charge-to-spin conversions in graphene/MoTe2 van der Waals heterostructures
• Strong manipulation of the valley splitting upon twisting and gating in MoSe${}_2$/CrI${}_3$ and WSe${}_2$/CrI${}_3$ van der Waals heterostructures
• Spin-orbit and exchange proximity couplings in graphene/1T-TaS${}_2$ heterostructure triggered by a charge density wave
• Tunable superconductivity and Möbius Fermi surfaces in an inversion-symmetric twisted van der Waals heterostructure