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O: Fachverband Oberflächenphysik
O 80: Poster Session - Graphene: Adsorption, Intercalation and Doping
O 80.5: Poster
Mittwoch, 18. März 2020, 18:15–20:00, P2/EG
Proximity superconductivity in hydrogen-intercalated graphene on 6H-SiC(0001) — •Tobias Birk1, Fabian Paschke1, Ulrich Starke2, and Mikhail Fonin1 — 1Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — 2Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
Here we investigate the superconducting proximity effect in hydrogen-intercalated graphene on 6H-SiC(0001) by means of scanning tunneling microscopy and spectroscopy. We epitaxially grow Pb islands (width 10-50 nm, thickness 4-15 monolayers) on top of the quasi-free standing monolayer graphene. Low bias tunneling spectra measured at 1.8 K show a bulk-like BCS gap on top of the islands. The critical field of the Pb islands is found to strongly correlate with size and number of monolayers. The variations of the proximity-induced superconducting gap is measured on graphene in the vicinity of Pb islands, both as function of spatial position and magnetic field strength. Our study provides a foundation for realization of graphene-superconductor heterostructures on large-scale SiC(0001) wafers suitable for future technological applications.