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TT: Fachverband Tiefe Temperaturen

TT 91: 2D Materials VII: Heterostructures (joint session O/TT)

TT 91.6: Vortrag

Freitag, 22. März 2024, 11:45–12:00, MA 005

Interplay of tunnelling gap and Faraday-like screening in graphene heterostructures — •Tobias Wichmann^1,2,3, Keda Jin^1,2,4, Jose Martinez Castro^1,4, Honey Boban⁵, Lukasz Plucinski⁵, Tom G. Saunderson^6,7, Yuriy Mokrousov^6,7, Markus Ternes^1,2,4, F. Stefan Tautz^1,2,3, and Felix Lüpke^1,2 — ¹Peter-Grünberg-Institut (PGI-3), Forschungszentrum Jülich, Germany — ²Jülich Aachen Research Alliance (JARA) - Fundamentals of Future Information Technology, Germany — ³Institut für Experimentalphysik IV A, RWTH Aachen, Germany — ⁴Institut für Experimentalphysik II B, RWTH Aachen, Germany — ⁵Peter-Grünberg-Institut (PGI-6), Forschungszentrum Jülich, Germany — ⁶Institute of Physics, Johannes Gutenberg University, Mainz, Germany — ⁷Peter-Grünberg-Institut (PGI-1) and Institute for Advanced Simulations (IAS), Forschungszentrum Jülich, Germany

Scanning tunneling spectroscopy of graphene shows a gap around the Fermi energy, as tunnelling channels to the graphene Dirac states are suppressed due to their finite momentum in the graphene plane. Until now, applications of this phenomenon have been lacking. We report the interplay of the tunnelling gap and Faraday-like screening in graphene placed on Fe₃GeTe₂ (FGT). By tunnelling through the electronic gap of the graphene into the underlying FGT surface, we directly access the electronic properties of the graphene/FGT van der Waals interface. Studying the magnetoelectric tunability of the heterostructure properties, we find Faraday-like screening of the electric field exerted by the tunnelling probe by the graphene.

Keywords: Scanning Tunneling Microscopy; Van der Waals heterostructure; Graphene encapsulation; Fe3GeTe2