Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: Focus Session: Charge Transport at Surfaces and Nanostructures with Multi-probe Techniques
O 63.5: Poster
Dienstag, 21. März 2017, 18:30–20:30, P2-OG3
Quasi-free-standing bilayer graphene nanoribbons probed by electronic transport — •Johannes Aprojanz1, Ilio Miccoli1, Jens Baringhaus1, Timo Lichtenstein1, Lauren A. Galves2, Joao Marcelo J. Lopes2, and Christoph Tegenkamp1 — 1Institut für Festkörperphysik, Leibniz Universität Hannover, Germany — 2Paul-Drude-Institut für Festkörperelektronik, Berlin, Germany
Graphene nanoribbons (GNR), directly grown on insulating SiC-templates, have attracted much intention due to their unique electronic properties. The growth of armchair and zig-zag orientated GNR with tunable band gaps and topologically protected metallic edge states was recently demonstrated [1,2]. Here, we present a detailed study of the structural and electronic transport properties of novel oxygen-intercalated bilayer graphene nanoribbons grown along step edges of SiC(0001) substrates [3]. The local transport properties as well as the microscopic structure have been investigated using a 4-tip STM/SEM system. Probe spacing dependent measurements combined with spectroscopic analyses reveal a hole concentration of 1 × 1013 cm−2 and mobilities up to 700 cm2/Vs of as-grown GNR at room temperature, which we attribute to an interlayer charge hopping mechanism.
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