Twist-angle tunable spin texture in WSe${}_2$/graphene van der Waals heterostructures

Abstract

Angle-twisting engineering has emerged as a powerful tool for modulating electronic properties in van der Waals heterostructures. Recent theoretical works have predicted the modulation of spin texture in graphene-based heterostructures by twist angle, although an experimental verification is missing. Here, we demonstrate the tunability of the spin texture and associated spin-charge interconversion with twist angle in WSe${}_2$/graphene heterostructures by using spin precession experiments. For specific twist angles, we experimentally detect a spin component radial with the electron's momentum, in addition to the standard orthogonal component. Our results show that the helicity of the spin texture can be reversed by angle twisting, highlighting its critical role on the spin-orbit properties of WSe${}_2$/graphene heterostructures and paving the way for the development of novel spin-twistronic devices.

14 pages, 5 figures and Supplementary Information

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• Moiré heterostructures as a condensed matter quantum simulator
• Edge chirality determination of graphene by Raman spectroscopy
• Twist-angle dependence of the proximity spin-orbit coupling in graphene on transition-metal dichalcogenides
• Optimal charge-to-spin conversion in graphene on transition metal dichalcogenides
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• Gate tunability of highly efficient spin-to-charge conversion by spin Hall effect in graphene proximitized with WSe${}_2$
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• Ferroelectric switching control of spin current in graphene proximitized by In${}_2$Se${}_3$
• The interplay of ferroelectricity and magneto-transport in non-magnetic moiré superlattices
• Interface engineering of van der Waals heterostructures towards energy-efficient quantum devices operating at high temperatures
• Designing Topological High-Order Van Hove Singularities: Twisted Bilayer Kagomé
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• Hanle effect in current induced spin orientation
• Increasing the proximity induced spin-orbit coupling in bilayer graphene/WSe${}_2$ heterostructures with pressure
• Tuning proximity-induced spin-orbit coupling in graphene/WSe${}_2$ heterostructures
• Gate tunable spin-charge interconversion in a graphene/ReS${}_2$ heterostructure up to room temperature
• Gate-tunable charge-spin interconversion in graphene/heavy-metal heterostructures
• Radial Rashba spin-orbit fields in commensurate twisted transition-metal dichalcogenide bilayers