Hybrid W-shaped graphene nanoribbons: Distinct electronic and transport properties

Kou, Liangzhi, Tang, Chun, Chen, Changfeng, & Guo, Wanlin (2011) Hybrid W-shaped graphene nanoribbons: Distinct electronic and transport properties. Journal of Applied Physics, 110(12), p. 124312.

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Abstract

We present a first-principles study of electronic and transport properties of a novel W-shaped graphene nanoribbon (W-GNR) structure that comprises hybrid GNR segments with alternating armchair and zigzag edges. Such hybrid W-GNRs exhibit semiconducting characteristics with distinct properties that stem from a unique combination of the features of the armchair and zigzag constituents. When the ribbon is narrow, the interplay of the two GNR components leads to much reduced variation in band gap. The spin-polarized edge states of the zigzag GNR engender an electric-field-driven half-metallicity. Moreover, spin-dependent density of states at the band edge produces asymmetric spin transmission coefficients, yielding unequal spin currents under a large bias voltage. These findings suggest that these new W-GNRs hold great promise for applications in nanoscale spintronic devices.

Impact and interest:

7 citations in Scopus
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5 citations in Web of Science®

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ID Code: 98227
Item Type: Journal Article
Refereed: Yes
DOI: 10.1063/1.3669496
ISSN: 1089-7550
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2011 American Institute of Physics
Deposited On: 29 Aug 2016 00:19
Last Modified: 31 Aug 2016 05:50

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