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The influence of the zigzag and armchair leads on quantum transport through the graphene based quantum rings

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Abstract

The conductivity of a graphene ring with two semi-infinite, armchair and zigzag leads has been investigated. We have performed numerical calculations based on the nearest neighbor tight-binding Hamiltonian and Dirac point approximation. A Non-Equilibrium Green’s Function (NEGF) approach has been employed to calculate the electric current under an applied bias voltage, in this two terminal mesoscopic system. We have studied the effect of the external magnetic field on transport characteristics of this graphene-based quantum ring. Coherent transport features of the system have been studied. It was shown that there is significant distinction between the I–V characteristics (and also the Aharonov-Bohm effect) of the graphene rings depending on the edge structure of the leads.

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Acknowledgement

This research has been supported by Azarbaijan Shahid Madani University.

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Authors and Affiliations

  1. Moghadase Ardabili University, 5615846583, Ardabil, Iran

    S. Mahnia

  2. Department of Physics, Azarbaijan Shahid Madani University, 53714-161, Tabriz, Iran

    S. Mahnia & A. Phirouznia

  3. Plasma & Condensed Matter Computational Research Lab., Azarbaijan Shahid Madani University, 53714-161, Tabriz, Iran

    A. Phirouznia

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  1. S. Mahnia
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  2. A. Phirouznia
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Correspondence to A. Phirouznia.

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Mahnia, S., Phirouznia, A. The influence of the zigzag and armchair leads on quantum transport through the graphene based quantum rings. J Comput Electron 13, 224–229 (2014). https://doi.org/10.1007/s10825-013-0503-6

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  • DOI: https://doi.org/10.1007/s10825-013-0503-6

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