SKM 2021 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 27: Topological Insulators and Semimetals (joint session TT/KFM)
TT 27.6: Talk
Friday, October 1, 2021, 11:30–11:45, H7
Berry curvature-induced local spin polarisation in gated graphene/WTe2 heterostructures — •Jonas Kiemle1,2, Lukas Powalla3,4, Elio J. König3, Andreas P. Schnyder3, Johannes Knolle2,5, Klaus Kern3,4, Alexander Holleitner1,2, Christoph Kastl1,2, and Marko Burghard3 — 1Walter Schottky Institut and Physics Department, Technical University of Munich, Am Coulombwall 4a, Garching — 2MCQST, Schellingstrasse 4, München — 3Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, Stuttgart — 4Institut de Physique, Ecole Polytechnique Fédérale de Lausanne, Lausanne — 5Department of Physics TQM, Technical University of Munich, James-Frank-Strasse 1, Garching
Experimental control of local spin-charge interconversion is of primary interest for spintronics. Van der Waals heterostructures combining graphene with a strongly spin-orbit coupled two-dimensional (2D) material enable such functionality by design. Here, we probe the gate-tunable local spin polarisation in current-driven graphene/WTe2 heterostructures through magneto-optical Kerr microscopy. We observe, that even for a nominal in-plane transport, substantial out-of-plane spin accumulation is induced by a corresponding out-of-plane current flow [1]. 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.
[1] L. Powalla, J. Kiemle et al., arXiv:2106.15509 (2021)