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Applied Physics Letters / Volume 100 / Issue 5 / SEMICONDUCTORS

Appl. Phys. Lett. 100, 052112 (2012); http://dx.doi.org/10.1063/1.3681775 (4 pages)

Negative differential spin conductance in doped zigzag graphene nanoribbons

Ting-Ting Wu1,2, Xue-Feng Wang1, Ming-Xing Zhai1,2, Hua Liu1,2, Liping Zhou1, and Yong-Jin Jiang2

1Department of Physics, Soochow University, Suzhou 215006, China
2Department of Physics, Zhejiang Normal University, Jinhua 231004, China

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(Received 1 September 2011; accepted 12 January 2012; published online 2 February 2012)

The spin dependent charge transport in zigzag graphene nanoribbons (ZGNRs) has been investigated by the nonequilibrium Green’s function method combined with the density functional theory at the local spin density approximation. The current versus voltage curve shows distinguished behaviors for symmetric and asymmetric ZGNRs, and the doping on the ZGNR edges can manipulate the spin transport. In special cases that a Be atom is substitutionally doped on one edge of the symmetric ZGNRs, one spin current shows negative differential resistance, whereas the other increases monotonically with the bias. This property might be used to design spin oscillators or other devices for spintronics.

© 2012 American Institute of Physics

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KEYWORDS and PACS

Keywords

beryllium, density functional theory, graphene, Green's function methods, nanoribbons, negative resistance, spin polarised transport

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3681775

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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