Anomalous Nonlocal Resistance and Spin-charge Conversion Mechanisms in Two-Dimensional Metals

Abstract

We uncover two anomalous features in the nonlocal transport behavior of two-dimensional metallic materials with spin-orbit coupling. Firstly, the nonlocal resistance can have negative values and oscillate with distance, even in the absence of a magnetic field. Secondly, the oscillations of the nonlocal resistance under an applied in-plane magnetic field (Hanle effect) can be asymmetric under field reversal. Both features are produced by direct magnetoelectric coupling, which is possible in materials with broken inversion symmetry but was not included in previous spin diffusion theories of nonlocal transport. These effects can be used to identify the relative contributions of different spin-charge conversion mechanisms. They should be observable in adatom-functionalized graphene, and may provide the reason for discrepancies in recent nonlocal transport experiments on graphene.

5 pages, 3 figures, and Supplementary Materials, to appear in Phys. Rev. Lett

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Cited by in corpus (11)

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• Resonant photovoltaic effect in doped magnetic semiconductors
• Large spin-relaxation anisotropy in bilayer-graphene/WS${}_2$ heterostructures
• Extrinsic Spin-Charge Coupling in Diffusive Superconducting Systems
• Unambiguous Electrical Detection of Spin-Charge Conversion in Lateral Spin-Valves
• Microscopic linear response theory of spin relaxation and relativistic transport phenomena in graphene
• Numerical study of the negative nonlocal resistance and the backflow current in a ballistic graphene system
• Spin-charge conversion in disordered two-dimensional electron gases lacking inversion symmetry
• Control of Spin Diffusion and Suppression of the Hanle Effect by the Coexistence of Spin and Valley Hall Effects
• Theory of Spin Injection in Two-dimensional Metals with Proximity-Induced Spin-Orbit Coupling
• Enhancement of Spin-charge Conversion in Dilute Magnetic Alloys by Kondo Screening