Theory of Spin Injection in Two-dimensional Metals with Proximity-Induced Spin-Orbit Coupling

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JournalPhys. Rev. B
DateAccepted/In press - 19 Dec 2019
DatePublished (current) - 19 Dec 2019
Issue number24
Volume100
Original languageEnglish

Abstract

Spin injection is a powerful experimental probe into a wealth of nonequilibrium spin-dependent phenomena displayed by materials with spin-orbit coupling (SOC). Here, we develop a theory of coupled spin-charge diffusive transport in two-dimensional spin-valve devices. The theory describes a realistic proximity-induced SOC with both spatially uniform and random components of the SOC due to adatoms and imperfections, and applies to the two dimensional electron gases found in two-dimensional materials and van der Walls heterostructures. The various charge-to-spin conversion mechanisms known to be present in diffusive metals, including the spin Hall effect and several mechanisms contributing current-induced spin polarization are accounted for. Our analysis shows that the dominant conversion mechanisms can be discerned by analyzing the nonlocal resistance of the spin-valve for different polarizations of the injected spins and as a function of the applied in-plane magnetic field.

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©2019 American Physical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

16 pages, 3 figures.

    Research areas

  • graphene, spintronics, spin injection, SPIN TRANSPORT

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