Substrate induced nanoscale resistance variation in epitaxial graphene

Anna Sinterhauf (), Georg A. Traeger, Davood Momeni Pakdehi, Philip Schädlich, Philip Willke, Florian Speck, Thomas Seyller, Christoph Tegenkamp, Klaus Pierz, Hans Werner Schumacher and Martin Wenderoth ()
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Anna Sinterhauf: Georg-August-Universität Göttingen
Georg A. Traeger: Georg-August-Universität Göttingen
Davood Momeni Pakdehi: Physikalisch-Technische Bundesanstalt
Philip Schädlich: Technische Universität Chemnitz
Philip Willke: Institute for Basic Science (IBS)
Florian Speck: Technische Universität Chemnitz
Thomas Seyller: Technische Universität Chemnitz
Christoph Tegenkamp: Technische Universität Chemnitz
Klaus Pierz: Physikalisch-Technische Bundesanstalt
Hans Werner Schumacher: Physikalisch-Technische Bundesanstalt
Martin Wenderoth: Georg-August-Universität Göttingen

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Graphene, the first true two-dimensional material, still reveals the most remarkable transport properties among the growing class of two-dimensional materials. Although many studies have investigated fundamental scattering processes, the surprisingly large variation in the experimentally determined resistances is still an open issue. Here, we quantitatively investigate local transport properties of graphene prepared by polymer assisted sublimation growth using scanning tunneling potentiometry. These samples exhibit a spatially homogeneous current density, which allows to analyze variations in the local electrochemical potential with high precision. We utilize this possibility by examining the local sheet resistance finding a significant variation of up to 270% at low temperatures. We identify a correlation of the sheet resistance with the stacking sequence of the 6H silicon carbide substrate and with the distance between the graphene and the substrate. Our results experimentally quantify the impact of the graphene-substrate interaction on the local transport properties of graphene.

Date: 2020
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DOI: 10.1038/s41467-019-14192-0

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