In this work, spin transport in corrugated armchair graphene nanoribbons (AGNRs) is studied. We survey combined effects of spin-orbit interaction and surface roughness, employing the non-equilibrium Green's function formalism and multi-orbitals tight-binding model. Rough substrate surfaces have been statistically generated and the hopping parameters are modulated based on the bending and distance of corrugated carbon atoms. The effects of surface roughness parameters, such as roughness amplitude and correlation length, on spin transport in AGNRs are studied. The increase of surface roughness amplitude results in the coupling of σ and π bands in neighboring atoms, leading to larger spin flipping rate and therefore reduction of the spin-polarization, whereas a longer correlation length makes AGNR surface smoother and increases spin-polarization. Moreover, spin diffusion length of carriers is extracted and its dependency on the roughness parameters is investigated. In agreement with experimental data, the spin diffusion length for various substrate ranges between 2 and 340 μm. Our results indicate the importance of surface roughness on spin-transport in graphene.
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7 August 2016
Research Article|
August 05 2016
Spin relaxation in graphene nanoribbons in the presence of substrate surface roughness
Zahra Chaghazardi;
Zahra Chaghazardi
1Department of Electrical Engineering,
Sharif University of Technology
, Tehran 11365-8639, Iran
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Shoeib Babaee Touski
;
Shoeib Babaee Touski
2School of Electrical and Computer Engineering,
University of Tehran
, Tehran 14395-515, Iran
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Mahdi Pourfath;
Mahdi Pourfath
a)
2School of Electrical and Computer Engineering,
University of Tehran
, Tehran 14395-515, Iran
3School of Nano Science,
Institute for Research on Fundamental Sciences (IPM)
, Tehran 19395-5531, Iran
4Institute for Microelectronics,
Technische Universität Wien
, Gußhausstraße 27–29/E360, A-1040 Wien, Austria
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Rahim Faez
Rahim Faez
1Department of Electrical Engineering,
Sharif University of Technology
, Tehran 11365-8639, Iran
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Zahra Chaghazardi
1
Shoeib Babaee Touski
2
Mahdi Pourfath
2,3,4,a)
Rahim Faez
1
1Department of Electrical Engineering,
Sharif University of Technology
, Tehran 11365-8639, Iran
2School of Electrical and Computer Engineering,
University of Tehran
, Tehran 14395-515, Iran
3School of Nano Science,
Institute for Research on Fundamental Sciences (IPM)
, Tehran 19395-5531, Iran
4Institute for Microelectronics,
Technische Universität Wien
, Gußhausstraße 27–29/E360, A-1040 Wien, Austria
J. Appl. Phys. 120, 053904 (2016)
Article history
Received:
May 09 2016
Accepted:
July 22 2016
Citation
Zahra Chaghazardi, Shoeib Babaee Touski, Mahdi Pourfath, Rahim Faez; Spin relaxation in graphene nanoribbons in the presence of substrate surface roughness. J. Appl. Phys. 7 August 2016; 120 (5): 053904. https://doi.org/10.1063/1.4960354
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