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“School of Nano-Sciences”

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Paper   IPM / Nano-Sciences / 12858
School of Nano Science
  Title:   A recursive Green's function method to study of monatomic gas adsorption effects on conductivity in a graphene nanoribbon
  Author(s): 
1 . Ali Asghar Shokri
2 . A. H. Mosavat
  Status:   Published
  Journal: Superlattices and Microstructures
  No.:  May 2013
  Vol.:  57
  Year:  2013
  Pages:   95-101
  Publisher(s):   Elsevier Ltd.
  Supported by:  IPM
  Abstract:
In this work, we present a recursive Green's function method to calculate electronic transport of armchair graphene nanoribbon (AGNR) and zigzag graphene nanoribbons (ZGNRs) quantum wires with randomly adsorption of monatomic gas molecules, which attached to two semi-infinite metallic leads. This model reduces numerical calculations time and enables us to use Green's function method to investigate transport in a supperlattice device. The calculations based on the Landauer-type formula within the tightbinding approximation, which the recursive Green's function method is used to solve inhomogeneous differential equations. The effects of monatomic gas molecules adsorption on electronic conductance properties are studied for various length and wide size of wire. Our numerical results show that the transport properties are strongly affected by the quantum interference effect, the lead interface geometry to the device and also adsorption of gas molecules on GNR sheets. By controlling the type of contact and wire geometry, this kind of system can explain the antiresonance states at the Fermi energy. The results can be used to control and engineer the graphene-based systems.

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