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O: Fachverband Oberflächenphysik
O 27: Graphene: Electronic properties, structure and substrate interaction II (joint session O/TT)
O 27.2: Vortrag
Dienstag, 13. März 2018, 11:00–11:15, MA 043
Probing bulk and edge transport channels in sidewall graphene nanoribbons by dual-probe spectroscopy — •Johannes Aprojanz1,2, Stephen Power3,4, Anti-Pekka Jauho4, Stephan Roche3, and Christoph Tegenkamp1,2 — 1Institut für Festkörperphysik, Leibniz Universität Hannover, Germany — 2Institut für Physik, Technische Universität Chemnitz, Germany — 3ICREA - Institucio Catalana de Recerca i Estudis Avancats, Barcelona, Spain — 4Technical University of Denmark, DTU Nanotech, Center for Nanostructured Graphene (CNG), Lyngby, Denmark
The electronic confinement in graphene nanoribbons (GNR) leads to the formation of subbands as well as topologically protected edge states. GNR epitaxially grown on nanofacets of SiC mesa structures have shown fully spin-polarized ballistic transport signatures for probe spacings larger than 200 nm [1]. By means of a 4-tip STM/SEM contacts with even smaller probe spacings were realized. In this regime sudden jumps to plateaus of multiples of the conductance quantum e2/h were observed using one blunt tip covering the entire GNR and one sharp tip gradually crossing the ribbon. We attribute these plateaus to edge and bulk transport channels, respectively. Based on tight-binding calculations these findings are explained by transversal electric fields which originate from distinct edge terminations on both sides of the GNR.
Baringhaus et al., Nature 506, 349 (2014)