| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Spin Filter of Graphene Nanoribbon Based Structure |
WAN Lang-Hui1, YU Yun-Jin1, WANG Bin2 |
| 1College of Physics Science and Technology, Shenzhen University, Shenzhen 518060 2Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong |
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| Cite this article: |
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WAN Lang-Hui, YU Yun-Jin, WANG Bin 2010 Chin. Phys. Lett. 27 087205 |
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Abstract Spin-dependent transport properties of the zigzag graphene nano-ribbon (zGNR) based structure Al-zGNR-Al are investigated by ab initio technique where density functional calculation is carried out within the Keldysh non-equilibrium Green's function formalism. The energy band structure of the infinite zigzag ribbon is sensitive to the dangling bonds of carbon atoms on both edge sides. For the three-circle-width zigzag ribbon with one edge monohydrogenated and the other edge dihydrogenated (zGNR(H-H2)), strongly spin-polarized energy bands are found. A spin-down branch is obtained just below the Fermi level while a spin up band appears above it. For the structure Al-zGNR(H-H2)-Al, where three-circle-width and seven-circle-length (3×7) zGNR(H-H2) is coupled by two (100) aluminium electrodes, an obvious spin filter property is found as the bias voltage changes. When the length of the sandwiched zGNR(H-H2) ribbon increases, the spin-up current is strongly restrained especially under higher bias voltage.
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| Keywords:
72.80.Ey
73.40.-c
73.63.-b
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Received: 27 April 2010
Published: 28 July 2010
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| PACS: |
72.80.Ey
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(III-V and II-VI semiconductors)
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73.40.-c
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(Electronic transport in interface structures)
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73.63.-b
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(Electronic transport in nanoscale materials and structures)
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