First-principles study on transport properties of zigzag graphene nanoribbon with different spin-configurations

An Liping; Liu Nianhua

doi:10.1088/1674-4926/32/5/052001

J. Semicond. > 2011, Volume 32 > Issue 5 > 052001

SEMICONDUCTOR PHYSICS

First-principles study on transport properties of zigzag graphene nanoribbon with different spin-configurations

An Liping and Liu Nianhua

+ Author Affiliations

DOI: 10.1088/1674-4926/32/5/052001

Abstract: The current-voltage (I-V) characteristics and the transmission spectrums of zigzag graphene nanoribbon with different spin-configurations are investigated by using the first-principles calculations. It is shown that the current-voltage curves and the transmission spectrums strongly depend on the spin-configurations of the two sides of the ribbon. For the spin-parallel configuration structure, the curve is linear under lower bias voltage; For the spin-antiparallel configuration structure, there is a strong spin-polarization-dependent transmission which implies the ribbon can be used as a spin filter; while for other spin-configurations structures, the curve has the characteristic of semiconductor. It is found that there is a large magneto-resistance(MR) when the bias voltage is small. The impurity in the central scattering region significantly influences the spin-dependent current and the spin filter efficiency, which may lead the large MR to disappear.

Key words: graphene nanoribbon, electronic transport, first-principles

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An Liping, Liu Nianhua. First-principles study on transport properties of zigzag graphene nanoribbon with different spin-configurations[J]. Journal of Semiconductors, 2011, 32(5): 052001. doi: 10.1088/1674-4926/32/5/052001

An L P, Liu N H. First-principles study on transport properties of zigzag graphene nanoribbon with different spin-configurations[J]. J. Semicond., 2011, 32(5): 052001. doi: 10.1088/1674-4926/32/5/052001.

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Received: Revised: 03 October 2010 Online: Published: 01 May 2011

The current-voltage (I-V) characteristics and the transmission spectrums of zigzag graphene nanoribbon with different spin-configurations are investigated by using the first-principles calculations. It is shown that the current-voltage curves and the transmission spectrums strongly depend on the spin-configurations of the two sides of the ribbon. For the spin-parallel configuration structure, the curve is linear under lower bias voltage; For the spin-antiparallel configuration structure, there is a strong spin-polarization-dependent transmission which implies the ribbon can be used as a spin filter; while for other spin-configurations structures, the curve has the characteristic of semiconductor. It is found that there is a large magneto-resistance(MR) when the bias voltage is small. The impurity in the central scattering region significantly influences the spin-dependent current and the spin filter efficiency, which may lead the large MR to disappear.

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