Strongly anisotropic spin relaxation in graphene/transition metal dichalcogenide heterostructures at room temperature

Abstract

Graphene has emerged as the foremost material for future two-dimensional spintronics due to its tuneable electronic properties. In graphene, spin information can be transported over long distances and, in principle, be manipulated by using magnetic correlations or large spin-orbit coupling (SOC) induced by proximity effects. In particular, a dramatic SOC enhancement has been predicted when interfacing graphene with a semiconducting transition metal dechalcogenide, such as tungsten disulphide (WS${}_2$). Signatures of such an enhancement have recently been reported but the nature of the spin relaxation in these systems remains unknown. Here, we unambiguously demonstrate anisotropic spin dynamics in bilayer heterostructures comprising graphene and WS${}_2$. By using out-of-plane spin precession, we show that the spin lifetime is largest when the spins point out of the graphene plane. Moreover, we observe that the spin lifetime varies over one order of magnitude depending on the spin orientation, indicating that the strong spin-valley coupling in WS${}_2$ is imprinted in the bilayer and felt by the propagating spins. These findings provide a rich platform to explore coupled spin-valley phenomena and offer novel spin manipulation strategies based on spin relaxation anisotropy in two-dimensional materials.

References in corpus (12)

• Graphene Spintronics
• Spin-Orbit Proximity Effect in Graphene
• Opto-Valleytronic Spin Injection in Monolayer MoS2/Few-Layer Graphene Hybrid Spin Valves
• Large Proximity-Induced Spin Lifetime Anisotropy in Transition Metal Dichalcogenide/Graphene Heterostructures
• Tunable spin-orbit coupling and symmetry-protected edge states in graphene/WS${}_2$
• Proximity effects in bilayer graphene on monolayer WSe${}_2$: Field-effect spin-valley locking, spin-orbit valve, and spin transistor
• Strong electron-hole symmetric Rashba spin-orbit coupling in graphene/monolayer transition metal dichalcogenide heterostructures
• Optimal charge-to-spin conversion in graphene on transition metal dichalcogenides
• Spin Hall effect and Weak Antilocalization in Graphene/Transition Metal Dichalcogenide Heterostructures
• Determination of the spin-lifetime anisotropy in graphene using oblique spin precession
• Optospintronics in graphene via proximity coupling
• Spin precession in anisotropic media

Cited by in corpus (127)

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• KITE: high-performance accurate modelling of electronic structure and response functions of large molecules, disordered crystals and heterostructures
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• Twist Angle Controlled Collinear Edelstein Effect in van der Waals Heterostructures
• Direct detection of induced magnetic moment and efficient spin-to-charge conversion in graphene/ferromagnetic structures
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• Van der Waals heterostructures with spin-orbit coupling
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• Giant Spin Transport Anisotropy in Magnetic Topological Insulators
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• Valley-Polarized Quantum Anomalous Hall Phase in Bilayer Graphene with Layer-Dependent Proximity Effects
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