Adiabatic and non-adiabatic quantum charge and spin pumping in zigzag and armchair graphene nanoribbons

We propose a graphene nanoribbon pumping device and study its quantum charge and spin pumping properties for both adiabatic and non-adiabatic regimes by using the Keldysh non-equilibrium Green's function and renormalization procedure. We show that the adiabatic regime is suitable for the genera...

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Bibliographic Details
Published in:Journal of applied physics 2020-04, Vol.127 (16)
Main Authors: Bourbour, Fatemeh, Esmaeilzadeh, Mahdi, Elahi, Seyed Mohammad, Eslami, Leila
Format: Article
Language:English
Subjects:
Adiabatic flow
Applied physics
Graphene
Green's functions
Molecular chains
Nanoribbons
Pumping
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Summary:We propose a graphene nanoribbon pumping device and study its quantum charge and spin pumping properties for both adiabatic and non-adiabatic regimes by using the Keldysh non-equilibrium Green's function and renormalization procedure. We show that the adiabatic regime is suitable for the generation of high charge current, while the non-adiabatic regime is appropriate for the generation of fully spin polarized and pure spin currents. Also, it is shown that the proposed device can act as a perfect and controllable spin filter. Moreover, we investigate the effects of width and edge of graphene nanoribbons and show that the pumped charge current in the zigzag graphene nanoribbon (ZGNR) strongly depends on nanoribbon width so that the maximum pumped current for width with even numbers of carbon chains is about one order of magnitude larger than that with odd numbers. In contrast with ZGNR, in armchair graphene nanoribbon, the pumped currents with even and odd numbers have the same order of magnitude.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5128775