SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 82: Graphene I: Adsorption, Intercalation and Doping

O 82.1: Vortrag

Donnerstag, 30. März 2023, 15:00–15:15, GER 37

Graphene quantum dot nanoarray in a van der Waals heterostructure — •Keda Jin^1,2,3, Junting Zhao^1,2,3, Tobias Wichmann^1,3,4, F. Stefan Tautz^1,3,4, Jose Martinez-Castro^1,3, Markus Ternes^1,2,3, and Felix Lüpke^1,3 — ¹Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany. — ²Institut für Experimentalphysik II B, RWTH Aachen, 52074 Aachen, Germany. — ³Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, 52425 Jülich, Germany. — ⁴Institut für Experimentalphysik IV A, RWTH Aachen, 52074 Aachen, Germany.

Graphene quantum dots (GQDs) are promising candidates for spin qubits because of their long spin coherence and short switching time. Although isolated GQDs have been created in van der Waals (vdW) heterostructures, the fabrication of GQD nanoarrays is still an ongoing challenge. Here, we realize a regular two-dimensional array of GQDs in a vdW heterostructure composed of graphene on a single layer of 1T-NbSe₂ on top of 2H-NbSe₂ (Gr/1T/2H-NbSe₂) by combining mechanically assembled vdW heterostructures and nanoscale phase engineering. Using scanning tunneling microscopy (STM) and non-contact atomic force microscopy (nc-AFM), we demonstrate that the 1T-NbSe₂ phase periodically dopes the graphene layer, which in response exhibits quantized charge states that can be manipulated by the local electric field of the tip. Our findings show a possible route for the creation of a highly dense GQD nanoarray with a potential application in the quantum technologies.