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Berry curvature-induced local spin polarisation in gated graphene/WTe2 heterostructures

Author

Listed:
  • Lukas Powalla

    (Max-Planck-Institut für Festkörperforschung)

  • Jonas Kiemle

    (Technical University of Munich
    MCQST)

  • Elio J. König

    (Max-Planck-Institut für Festkörperforschung)

  • Andreas P. Schnyder

    (Max-Planck-Institut für Festkörperforschung)

  • Johannes Knolle

    (MCQST
    Technical University of Munich
    Imperial College London)

  • Klaus Kern

    (Max-Planck-Institut für Festkörperforschung
    Ecole Polytechnique Fédérale de Lausanne)

  • Alexander Holleitner

    (Technical University of Munich
    MCQST)

  • Christoph Kastl

    (Technical University of Munich
    MCQST)

  • Marko Burghard

    (Max-Planck-Institut für Festkörperforschung)

Abstract

Experimental control of local spin-charge interconversion is of primary interest for spintronics. Van der Waals (vdW) heterostructures combining graphene with a strongly spin-orbit coupled two-dimensional (2D) material enable such functionality by design. Electric spin valve experiments have thus far provided global information on such devices, while leaving the local interplay between symmetry breaking, charge flow across the heterointerface and aspects of topology unexplored. Here, we probe the gate-tunable local spin polarisation in current-driven graphene/WTe2 heterostructures through magneto-optical Kerr microscopy. Even for a nominal in-plane transport, substantial out-of-plane spin accumulation is induced by a corresponding out-of-plane current flow. We present a theoretical model which fully explains the gate- and bias-dependent onset and spatial distribution of the intense Kerr signal as a result of a non-linear anomalous Hall effect in the heterostructure, which is enabled by its reduced point group symmetry. Our findings unravel the potential of 2D heterostructure engineering for harnessing topological phenomena for spintronics, and constitute an important step toward nanoscale, electrical spin control.

Suggested Citation

  • Lukas Powalla & Jonas Kiemle & Elio J. König & Andreas P. Schnyder & Johannes Knolle & Klaus Kern & Alexander Holleitner & Christoph Kastl & Marko Burghard, 2022. "Berry curvature-induced local spin polarisation in gated graphene/WTe2 heterostructures," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-30744-3
    DOI: 10.1038/s41467-022-30744-3
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    References listed on IDEAS

    as
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