Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 105: 2D Materials VII: Heterostructures (joint session O/TT)
O 105.8: Vortrag
Freitag, 22. März 2024, 12:15–12:30, MA 005
Engineering quantum dot nanoarrays in van der Waals heterostructures — •Keda Jin1,2, Lennart Klebl3, Junting Zhao1,2, Tobias Wichmann1,5, F. Stefan Tautz1,5, Felix Lüpke1, Dante Kennes4, Jose Martinez-Castro1,2, and Markus Ternes1,2 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany — 2Institut für Experimentalphysik II B, RWTH Aachen, 52074 Aachen, Germany — 3I.Institute for Theoretical Physics, Universität Hamburg, 22607 Hamburg, Germany — 4Institut für Theorie der statistischen Physik, RWTH Aachen, 52074 Aachen — 5Institut für Experimentalphysik IV A, RWTH Aachen, 52074 Aachen, Germany
Superlattice engineering in graphene has generated interest for their ability to mimic the moiré potential observed in twistronics. While the moiré potential is sensitive to the twist angle, we present a method to periodically modulate the graphene potential by stacking graphene on 1T/2H-NbSe2. The doping effect from the charge density wave of 1T-NbSe2 allows for the formation of quantum dot nanoarrays. Using scanning tunneling microscopy/spectroscopy, we visualized the localized electronic structures to be independent of the twist angle between graphene and NbSe2. Furthermore, we observed a bias-dependent strip pattern, breaking the six-fold rotational symmetry, which indicates an emergence of correlated states in the quantum dot nanoarrays. Our research paves the way for the fabrication of quantum dot nanoarrays in van der Waals heterostructures, extending beyond graphene to other 2D van der Waals heterostructures that are not limited by twist angle.
Keywords: graphene; scanning tunneling microscopy; quantum dots