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
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
Spin-dependent transport properties of the zigzag graphene nano-ribbon (zGNR) based structure Al-zGNR-Al are investigated by abinitio 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.
Spin-dependent transport properties of the zigzag graphene nano-ribbon (zGNR) based structure Al-zGNR-Al are investigated by abinitio 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.
(Electronic transport in nanoscale materials and structures)
引用本文:
WAN Lang-Hui;YU Yun-Jin;WANG Bin. Spin Filter of Graphene Nanoribbon Based Structure[J]. 中国物理快报, 2010, 27(8): 87205-087205.
WAN Lang-Hui, YU Yun-Jin, WANG Bin. Spin Filter of Graphene Nanoribbon Based Structure. Chin. Phys. Lett., 2010, 27(8): 87205-087205.
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