Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 14: Graphene II: Excitations and Nanoribbons (joint session O/TT)
O 14.4: Talk
Monday, April 1, 2019, 15:45–16:00, H24
Segregated transport channels in sidewall nanoribbons — •Stephen Power1,2,3, Johannes Aprojanz4, Pantelis Bampoulis5, 6, Stephan Roche1, 7, Antti-Pekka Jauho8, Harold Zandvliet6, Alexei Zakharov9, and Christoph Tegenkamp4, 5 — 1ICN2, Bellaterra, Spain — 2UAB, Bellaterra, Spain — 3School of Physics, Trinity College Dublin, Ireland — 4Institut für Physik, Technische Universität Chemnitz — 5Institut für Festkörperphysik, Leibniz Universität Hannover — 6MESA+Institute, University of Twente, The Netherlands — 7ICREA, Barcelona, Spain — 8CNG and DTU Nanotech, Denmark — 9MAX IV Laboratory and Lund University, Sweden
Conductance quantization is a defining feature of electronic transport in quasi-one dimensional conductors. In the absence of a magnetic field, confinement results in a sequence of transverse sub-bands with an increasing number of nodes across the device width. Graphene nanoribbons grown on the sidewalls of SiC mesa structures have previously[1] been shown to present a 1D ballistic channel at the micron scale. New 2-point measurements reveal additional quantised channels at shorter probe separations[2]. Surprisingly, these channels are localised in different regions across the ribbon width. Here we demonstrate how this distribution of channels is consistent with a model accounting for both edge zigzag magnetism and asymmetric interfaces between the SiC and nanoribbon at each edge.
[1] J. Baringhaus et al, Nature 506 (2014) 349 [2] J. Aprojanz, S.R. Power et al, Nature Communications 9 (2018)4426