Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 105: 2D Materials VII: Heterostructures (joint session O/TT)
O 105.6: Vortrag
Freitag, 22. März 2024, 11:45–12:00, MA 005
Interplay of tunnelling gap and Faraday-like screening in graphene heterostructures — •Tobias Wichmann1,2,3, Keda Jin1,2,4, Jose Martinez Castro1,4, Honey Boban5, Lukasz Plucinski5, Tom G. Saunderson6,7, Yuriy Mokrousov6,7, Markus Ternes1,2,4, F. Stefan Tautz1,2,3, and Felix Lüpke1,2 — 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