Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 19: Symposium Spin-Orbit Coupling and Spin Relaxation in Graphene and Carbon Nanotubes
O 19.3: Hauptvortrag
Montag, 22. März 2010, 15:10–15:45, H1
Spin-orbit interaction in carbon nanotubes probed in pulsed magnetic fields — •Sungho Jhang1, Magdalena Marganska2, Yurii Skourski3, Dominik Preusche1, Benoit Witkamp4, Milena Grifoni2, Herre van der Zant4, Joachim Wosnitza3, and Christoph Strunk1 — 1Institute of Experimental and Applied Physics, University of Regensburg, Germany — 2Institute for Theoretical Physics, University of Regensburg, Germany — 3Dresden High Magnetic Field Laboratory, Forschungszentrum Dresden-Rossendorf, Germany — 4Kavli Institute of Nanoscience, Delft University of Technology, The Netherlands
A source of spin-polarized electrons is one of the important building blocks of a future spin-based electronics. Very high degrees of polarization can potentially be achieved by exploiting spin-orbit interaction (SOI). Based on the low atomic number Z = 6 of carbon the spin-orbit interaction in carbon nanotubes (CNTs) was mostly believed to be very weak, until a recent experiment [1] has demonstrated the effect of spin-orbit interaction in clean CNT quantum dots. Here we present magneto-conductance (MC) data for an open CNT-quantum wire obtained in pulsed magnetic fields, which exhibit a peculiar split MC peak close to the charge neutrality point. Our analysis of the MC data suggests that this splitting is intimately connected to the SOI and the tube chirality and that the current in the peak regions can be up to 100% spin-polarized, which calls for application in future CNT-based spintronic devices.
[1] F. Kuemmeth et al., Nature (London) 452, 448 (2008).