Dresden 2017 – scientific programme

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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

Tuesday, March 21, 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.
Baringhaus et al., Nature 506, 349 (2014)
Palacio et al., Nano Letters 15, 182 (2015)
Oliveira et al., Nat. Comm. 6, 7632 (2015)