Spin currents in rough graphene nanoribbons: Universal fluctuations and spin injection

Details Spin currents in rough graphene nanoribbons: Universal fluctuations and spin injection Spin currents in rough graphene nanoribbons: Universal fluctuations and spin injection

2007-09-20

arxiv.org/abs/0709.3244v2

Phys. Rev. Lett. 100, 177207 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures, PdfLaTeX, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.100.177207

We investigate spin conductance in zigzag graphene nanoribbons and propose a spin injection mechanism based only on graphitic nanostructures. We find that nanoribbons with atomically straight, symmetric edges show zero spin conductance, but nonzero spin Hall conductance. Only nanoribbons with asymmetrically shaped edges give rise to a finite spin conductance and can be used for spin injection into graphene. Furthermore, nanoribbons with rough edges exhibit mesoscopic spin conductance fluctuations with a universal value of $\mathrm{rms} G_\mathrm{s}\approx 0.4 e/4\pi$.

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