Spin transport in high-mobility graphene on WS${}_2$ substrate with electric-field tunable proximity spin-orbit interaction

Abstract

Graphene supported on a transition metal dichalcogenide substrate offers a novel platform to study the spin transport in graphene in presence of a substrate induced spin-orbit coupling, while preserving its intrinsic charge transport properties. We report the first non-local spin transport measurements in graphene completely supported on a 3.5 nm thick tungsten disulfide (WS${}_2$) substrate, and encapsulated from the top with a 8 nm thick hexagonal boron nitride layer. For graphene, having mobility up to 16,000 cm${}^2$V${}^{-1}$s${}^{-1}$, we measure almost constant spin-signals both in electron and hole-doped regimes, independent of the conducting state of the underlying WS${}_2$ substrate, which rules out the role of spin-absorption by WS${}_2$. The spin-relaxation time ${\tau }_{\text{s}}$ for the electrons in graphene-on-WS${}_2$ is drastically reduced down to~10 ps than ${\tau }_{\text{s}}$ ~ 800 ps in graphene-on-SiO${}_2$ on the same chip. The strong suppression of ${\tau }_{\text{s}}$ along with a detectable weak anti-localization signature in the quantum magneto-resistance measurements is a clear effect of the WS${}_2$ induced spin-orbit coupling (SOC) in graphene. Via the top-gate voltage application in the encapsulated region, we modulate the electric field by 1 V/nm, changing ${\tau }_{\text{s}}$ almost by a factor of four which suggests the electric-field control of the in-plane Rashba SOC. Further, via carrier-density dependence of ${\tau }_{\text{s}}$ we also identify the fingerprints of the D'yakonov-Perel' type mechanism in the hole-doped regime at the graphene-WS${}_2$ interface.

arXiv comment11 pages, 7 figures

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• Unambiguous Electrical Detection of Spin-Charge Conversion in Lateral Spin-Valves
• Tunable spin-orbit coupling in two-dimensional InSe
• Collective spin modes in Fermi liquids with spin-orbit coupling
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• Twisted bilayer graphene reveals its flat bands under spin pumping
• Theory of Spin Injection in Two-dimensional Metals with Proximity-Induced Spin-Orbit Coupling
• Angular dependence of the interlayer coupling at the interface between two dimensional materials 1T-PtSe${}_2$ and graphene
• Increasing the proximity induced spin-orbit coupling in bilayer graphene/WSe${}_2$ heterostructures with pressure
• Zero-field spin resonance in graphene with proximity-induced spin-orbit coupling