Non-equilibrium tunneling in zigzag graphene nanoribbon break-junction results in spin filtering

Liming Jiang, Wanzhi Qiu, Md Sharafat Hossain, Feras Al-Dirini, Robin Evans, Efstratios Skafidas*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Spintronic devices promise new faster and lower energy-consumption electronic systems. Graphene, a versatile material and candidate for next generation electronics, is known to possess interesting spintronic properties. In this paper, by utilizing density functional theory and non-equilibrium green function formalism, we show that Fano resonance can be generated by introducing a break junction in a zigzag graphene nanoribbon (ZGNR). Using this effect, we propose a new spin filtering device that can be used for spin injection. Our theoretical results indicate that the proposed device could achieve high spin filtering efficiency (over 90%) at practical fabrication geometries. Furthermore, our results indicate that the ZGNR break junction lattice configuration can dramatically affect spin filtering efficiency and thus needs to be considered when fabricating real devices. Our device can be fabricated on top of spin transport channel and provides good integration between spin injection and spin transport.

Original languageEnglish
Article number053902
JournalJournal of Applied Physics
Volume119
Issue number5
DOIs
StatePublished - 7 Feb 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 AIP Publishing LLC.

ASJC Scopus subject areas

  • General Physics and Astronomy

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