Phys. Rev. Lett. 100, 177207 (2008) [4 pages]Spin Currents in Rough Graphene Nanoribbons: Universal Fluctuations and Spin InjectionReceived 20 September 2007; published 2 May 2008 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 rmsGs≈0.4e/4π. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.177207
DOI:
10.1103/PhysRevLett.100.177207
PACS:
85.75.−d, 72.25.−b, 73.22.−f, 73.63.−b
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.