Unconventional charge-spin conversion in Weyl-semimetal WTe2

Abstract

An outstanding feature of topological quantum materials is their novel spin topology in the electronic band structures with an expected large charge-to-spin conversion efficiency. Here, we report a charge current-induced spin polarization in the type-II Weyl semimetal candidate WTe2 and efficient spin injection and detection in a graphene channel up to room temperature. Contrary to the conventional spin Hall and Rashba-Edelstein effects, our measurements indicate an unconventional charge-to-spin conversion in WTe2, which is primarily forbidden by the crystal symmetry of the system. Such a large spin polarization can be possible in WTe2 due to a reduced crystal symmetry combined with its large spin Berry curvature, spin-orbit interaction with a novel spin-texture of the Fermi states. We demonstrate a robust and practical method for electrical creation and detection of such a spin polarization using both charge-to-spin conversion and its inverse phenomenon and utilized it for efficient spin injection and detection in a graphene channel up to room temperature. These findings open opportunities for utilizing topological Weyl materials as non-magnetic spin sources in allelectrical van der Waals spintronic circuits and for low-power and high-performance non-volatile spintronic technologies.

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• Machine learning driven synthesis of few-layered WTe2
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• Twist- and gate-tunable proximity spin-orbit coupling, spin relaxation anisotropy, and charge-to-spin conversion in heterostructures of graphene and transition-metal dichalcogenides
• Two-Dimensional Spintronic Circuit Architectures on Large Scale Graphene
• Unconventional charge-to-spin conversions in graphene/MoTe2 van der Waals heterostructures
• Determination of the spin axis in quantum spin Hall insulator monolayer WTe2
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• Large spin-to-charge conversion at the two-dimensional interface of transition metal dichalcogenides and permalloy
• Low-symmetry topological materials for large charge-to-spin interconversion: The case of transition metal dichalcogenide monolayers
• Efficient Spin-Orbit Torque Generation in Semiconducting WTe2 with Hopping Transport
• Resolving spin currents and spin densities generated by charge-spin interconversion in systems with reduced crystal symmetry
• Robust negative longitudinal magnetoresistance and spin-orbit torque in sputtered Pt3Sn topological semimetal
• Realization of the Chern insulator and Axion insulator phases in antiferromagnetic $MnTe$-$B{i}_2(Se,Te{)}_3$-$MnTe$ heterostructures
• Twist-angle dependent proximity induced spin-orbit coupling in graphene/topological insulator heterostructures
• Magnetic Proximity induced efficient charge-to-spin conversion in large area PtSe${}_2$/Ni${}_{80}$Fe${}_{20}$ heterostructures
• Room-temperature anisotropic in-plane spin dynamics in graphene induced by PdSe${}_2$ proximity
• Control of charge-spin interconversion in van der Waals heterostructures with chiral charge density waves
• Ferroelectric control of charge-to-spin conversion in WTe${}_2$
• Theoretical study of topological properties of ferromagnetic pyrite CoS${}_2$
• Enhancing Perpendicular Magnetic Anisotropy in Garnet Ferrimagnet by Interfacing with Few-Layer WTe2
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• Bulk photospin effect: Calculation of electric spin susceptibility to second order in an electric field
• Charge-spin conversion signal in WTe2 van der Waals hybrid devices with a geometrical design
• Spin supercurrent in superconductor/ferromagnet van-der-Waals heterostructures
• Room temperature nonlocal detection of charge-spin interconversion in a topological insulator
• Staggered spin Hall conductivity
• Nonlinear spin and orbital Edelstein effect in WTe2
• Nonlinear Edelstein Effect in Strongly Correlated Electron Systems
• Inverse Ising effect and Ising magnetoresistance
• Spin and orbital Edelstein effect in spin-orbit coupled noncentrosymmetric superconductor
• Out-of-plane spin-to-charge conversion at low temperatures in graphene/MoTe${}_2$ heterostructures
• Current-induced spin and orbital polarization in the ferroelectric Rashba semiconductor GeTe
• Current-induced spin polarisation in Rashba-Dresselhaus systems under different point groups
• Ferroelectric switching control of spin current in graphene proximitized by In${}_2$Se${}_3$
• Topological phases, van Hove singularities, and spin texture in magic-angle twisted bilayer graphene in the presence of proximity-induced spin-orbit couplings
• A magnetic excitation linking quasi-1D Chevrel-type selenide and arsenide superconductors
• Visualization of out-of-plane spin generation in mirror symmetry broken Co
• Boltzmann theory of the inverse Edelstein effect in a two-dimensional Rashba gas
• Reliability of spin-to-charge conversion measurements in graphene-based lateral spin valves
• Direct observation of distinct bulk and edge nonequilibrium spin accumulation in ultrathin MoTe${}_2$
• Impact of the out-of-plane conductivity on spin transport evaluation in a van der Waals material
• Large enhancement of Edelstein effect in Weyl semimetals from Fermi-arc surface states
• Gate-tunable charge-spin interconversion in graphene/heavy-metal heterostructures