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Spin Currents in Rough Graphene Nanoribbons: Universal Fluctuations and Spin Injection

URN to cite this document:
urn:nbn:de:bvb:355-epub-25770
DOI to cite this document:
10.5283/epub.2577
Wimmer, Michael ; Adagideli, İnanç ; Berber, Savaş ; Tomanek, David ; Richter, Klaus
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PDF - Accepted Version
arXiv PDF (17.04.2008)
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PDF - Submitted Version
arXiv PDF (20.09.2007)
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Date of publication of this fulltext: 05 Aug 2009 13:40



Abstract

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 $rms G_s = 0.4 e/4\\pi$.


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