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Strong current polarization and negative differential resistance in chiral graphene nanoribbons with reconstructed (2,1)-edges

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4 Author(s)
Li, Xiao-Fei ; School of Physics and Microelectronics Science, Hunan University, Changsha 410082, China ; Wang, Ling-Ling ; Chen, Ke-Qiu ; Luo, Yi

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We investigate electronic structures and transport properties of chiral-graphene-nanoribbons (CGNRs) with reconstructed (2,1)-edges. First principles results reveal that the (2,1)-CGNRs can be either spin non-polarized or polarized, depending on whether the edges are H-saturated or unsaturated. H-saturated systems are semiconductors with width-dependent transmission gap, while unsaturated systems are metallic at non-polarized state or at antiferromagnetic state and they are semiconductors at ferromagnetic state. Moreover, unsaturated systems possess strong current polarizations (nearly 100%) and a striking negative differential resistance behavior (with a peak-to-valley ratio about 105). These remarkable properties suggest the potential application of (2,1)-CGNRs in molectronics and spintronics.

Published in:

Applied Physics Letters  (Volume:101 ,  Issue: 7 )

Date of Publication:

Aug 2012

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