Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 121: Graphene (organized by DS)

HL 121.4: Vortrag

Freitag, 4. April 2014, 12:15–12:30, CHE 89

Charge and Spin Transport in Turbostratic Graphene and Graphene Nanoribbons — •Nils Richter1, Sebastian Schweizer2, Ajit Kumar Patra2, Yenny Hernandez3, Akimitsu Narita3, Xinliang Feng3, Petr Ostrizek1, Klaus Müllen3, and Mathias Kläui11Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany — 2FB Physik, Universität Konstanz, 78457 Konstanz, Germany — 3Max Planck Institute for Polymer Research, 55128 Mainz, Germany

We present two specially selected allotropes of graphene: Turbostratic graphene (TG) and graphene nanoribbons (GNRs).

TG discs are graphitic microstructures where the twisting of adjacent layers leads to an electronic decoupling. Electrical transport measurements reveal quantum effects such as weak localization and huge charge carrier mobilities (100,000 cm2/Vs) in protected bulk layers [1]. In non-local spin valves we find efficient spin injection over micrometer distances showing large spin diffusion lengths.

Using electromigrated nanojunctions we are able to investigate electrical and spin transport in chemically synthesized GNRs. As they are dispersed in a solvent [2] they can be drop cast on such junctions. With GNRs of different widths and edge geometries we will probe the exciting unconventional properties that have been predicted for these nanostructures [3].

[1] Y. Hernandez et al., arXiv:1301.6087 (under review 2013). [2] A. Narita et al., Nature Chem., in press, DOI: 10.1038/NCHEM.1819. [3] O. Yazyev, Rep. Prog. Phys. 73, 056501 (2010).

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