Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 63: Poster: Quantum Dots and Optics
HL 63.30: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P1A
Spin and charge transport in epitaxial graphene nanoribbons — •Talieh Ghiasi1, Alexey Kaverzin1, Jantje Schommartz1,2, Johannes Aprojanz2, Christoph Tegenkamp2, and Bart van Wees1 — 1Physics of Nanodevices, Zernike Institute for Advanced Materials, University of Groningen, the Netherlands — 2Institut für Festkörperphysik, Leibniz Universität Hannover, Germany
Graphene Nanoribbon (GNR) is the essential component of the future graphene-based Spintronics. Investigation of charge and spin transport in these quasi-one dimensional carbon based channels is the main focus of this experimental research. Evidence of ballistic transport in epitaxially grown GNR and the controlled well-defined spin-selective edges of the channel [1], show promises for ballistic fully spin-polarized transport in GNR-based devices. In this study, epitaxially grown GNRs on templated sidewalls and natural steps of SiC substrate are probed by ferromagnetic Cobalt electrodes made by electron-beam lithography technique. The use of the combination of local and non-local measurement geometries allows us to address charge and spin transport properties of studied GNRs independently. The finite conductance of the underlying SiC substrate is eliminated via using liquid Helium temperatures where the substrate becomes an order of magnitude more resistive than the studied nanoribbon. Various multi-terminal measurement configurations are used to separate the contact contribution and study directly the properties of the charge transport in GNR at different channel lengths and temperatures.
[1] Baringhaus, Jens, et al., Nature 506,349 (2014).