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HL: Fachverband Halbleiterphysik

HL 83: Poster: Graphene (with MA/O)

HL 83.8: Poster

Mittwoch, 2. April 2014, 17:00–20:00, P1

Graphene nanostructures produced from transfered layers — •Christopher Belke, Dmitri Smirnov, Johannes C. Rode, Hennrik Schmidt, and Rolf J. Haug — Institut für Festkörperphysik, Leibniz Universität Hannover, D-30167 Hannover, Germany

Graphene consists of carbon atoms, which are arranged in a two-dimensional honeycomb lattice. It has unique electronic properties, which can be examined in high quality samples [1]. These are often prepared by mechanical exfoliation on a silicon wafer with silicon dioxide on top. This substrate has a strong influence on the transport properties due to charge traps and surface roughness [2]. To reduce these effects or to produce novel complexe layersystems, graphene sheets can be stacked by a transfer methode e. g. onto other substrates or one upon the other to fabricate twisted flakes. The latter has been done and was under examination with magnetotransport measurements.
Graphene is exfoliated on a thin PMMA layer, which can be detached from the silicon wafer. This layer is then placed on another graphene mono- or bilayer flakes. The samples were characterized at low temperatures and in dependence of a magnetic field. Magnetic field independent oscillations could be observed in a multilayer system.

[1] K. S. Novoselov et al. Science 306, 666 (2004)

[2] P. Barthold et al. NJP 13, 0433020 (2011)