Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 99: Poster Session: Transport
TT 99.15: Poster
Donnerstag, 15. März 2018, 15:00–19:00, Poster B
Proximity induced superconductivity in edge connected ballistic normal metal-graphene-superconductor junctions — •Preeti Pandey1, Romain Danneau1, Ralph Krupke1,2, and Detlef Beckmann1 — 1Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Department of Materials and Earth Sciences, Technical University Darmstadt, Darmstadt, Germany
Here, we present an experimental study of proximity induced superconductivity in edge connected normal metal-graphene-superconductor (N-G-S) junctions. The monolayer graphene sheet was sandwiched between two hexagonal boron nitride (h-BN) crystals creating a van der Waals heterostructure. Conductance spectra for these junctions in the superconducting state were measured as a function of magnetic field and charge carrier density. Our experimental results have been analyzed and can be explained with a generalized BTK model. In addition, Fabry-Pérot interferences were observed in the normal state for hole as well as electron doping of the graphene sheet. It can be explained by the formation of different interfaces in the vicinity of the contacts designed with two different materials.