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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 39: Poster Tuesday: 2D Materials

O 39.3: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Transport Experiments Through Individual Graphene Nanoribbons — •Niklas Friedrich1, Jingcheng Li1, Pedro Brandimarte2, and Nacho Pascual1,31CIC nanoGUNE, 20018 San Sebastian-Donostia (Spain) — 2Donostia International Physics Center, 20018 San Sebastian-Donostia (Spain) — 3Ikerbasque, Basque Foundation for Science, 48013 Bilbao (Spain)

The bottom-up synthesis of atomically precise graphene nanoribbons (GNRs) envisions the production of model graphene structures with tuned electrical properties for electronic transport. However it is difficult to access experimentally the unperturbed bandstructure of ribbons, and furthermore, to probe their behaviour as electron transporting bands. In most scanning tunnelling spectroscopy (STS) experiments the GNRs are absorbed on a metallic substrate. This leads to a hybridization of the electronic orbitals of the GNRs with the metal and consequently a perturbation of the bandstructure.

Here we use the STM tip to contact one termination of 7-armchair GNRs with different functionalizations and partially lift them from the surface, to bridge tip and sample in a typical transport configuration. Such, the hybridization between GNR and substrate is reduced and we probe the effect on the GNR's band strucuture as transport channels. We study the evolution of the bandstructure during the lifting process for varying functionalization and compare our experimental results to DFT calculations.

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