Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 21: Transport: Graphene and Carbon Nanotubes
TT 21.7: Vortrag
Dienstag, 26. Februar 2008, 17:30–17:45, EB 202
Spin injection with rough graphene nanoribbons — •Michael Wimmer1, Inanç Adagideli1, Savaş Berber2, David Tománek2, and Klaus Richter1 — 1Institut für Theoretische Physik, Universität Regensburg, D-93040, Germany — 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-2320, USA
We investigate spin conductance in zigzag graphene nanoribbons
and propose a spin injection method based only on graphene.
Combining density functional theory with tight-binding transport calculations, we find that nanoribbons with asymmetrically shaped edges show a non-zero spin conductance and can be used for spin injection. Furthermore, nanoribbons with rough edges exhibit mesoscopic spin
conductance fluctuations with a universal value of rms Gs≈ 0.4 e/4π.
M. Wimmer, I. Adagideli, S. Berber, D. Tomanek, K. Richter, arXiv:0709.3244 (2007)