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O: Fachverband Oberflächenphysik

O 88: 2D Materials: Stacking and Heterostructures (joint session O/HL)

O 88.6: Vortrag

Donnerstag, 20. März 2025, 16:15–16:30, H6

Giant Zeeman effect at a magnetic topological van der Waals interface — Tobias Wichmann^1,2, Keda Jin^1,3, Jose Martinez-Castro^1,3, Tom G. Saunderson^4,5, Honey Boban⁶, Lukasz Plucinski⁶, Yuriy Mokrousov^4,5, Markus Ternes^1,3, F. Stefan Tautz^1,2, and •Felix Lüpke^1,7 — ¹Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich — ²Institut für Experimentalphysik IV A, RWTH Aachen University — ³Institut für Experimentalphysik II B, RWTH Aachen University — ⁴Institute of Physics, Johannes Gutenberg University Mainz — ⁵Peter Grünberg Institut (PGI-1) and Institute for Advanced Simulation (IAS), Forschungszentrum Jülich — ⁶Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich — ⁷II. Physikalisches Institut, Universität zu Köln

We report giant Zeeman effects with Landé g-factors up to g≈230 at the interface of graphene and the van der Waals (vdW) ferromagnet Fe₃GeTe₂ (FGT). They arise from orbital moments generated by the non-trivial band topology of the FGT and cause a huge asymmetric level splitting when a magnetic field is applied. By exploiting the inelastic phonon gap of graphene, we can directly access the vdW interface to the FGT underneath by scanning tunnelling microscopy and spectroscopy. By analyzing the Faraday-like screening of the tunnelling tip by the graphene, we are able to quantify the electric field at the vdW interface.

Keywords: Graphene; Magnetism; Scanning Tunneling Microscopy; Topological Nodal Line Metal; van der Waals heterostructure