Coherent transport of armchair graphene constrictions

The coherent transport properties of armchair graphene nanoconstrictions (GNC) are studied using tight-binding approach and Green's function method. We find a nonbonding state at zero Fermi energy which results in a zero conductance valley, when a single vacancy locates at y = 3 n ± 1 of a perf...

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Bibliographic Details
Published in:Journal of applied physics 2010-05, Vol.107 (10), p.103706-103706-6
Main Authors: Yin, HuiQiong, Li, Wei, Hu, Xiao, Tao, Ruibao
Format: Article
Language:English
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Summary:The coherent transport properties of armchair graphene nanoconstrictions (GNC) are studied using tight-binding approach and Green's function method. We find a nonbonding state at zero Fermi energy which results in a zero conductance valley, when a single vacancy locates at y = 3 n ± 1 of a perfect metallic armchair graphene nanoribbon (aGNR). However, the nonbonding state does not exist when a vacancy locates at y = 3 n , and the conductance behavior of lowest conducting channel will not be affected by the vacancy. For the square-shaped armchair GNC consisting of three metallic aGNR segments, resonant tunneling behavior is observed in the single channel energy region. We find that the presence of localized edge state locating at the zigzag boundary can affect the resonant tunneling severely. A simplified one dimensional model is put forward at last, which explains the resonant tunneling behavior of armchair GNC very well.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3391273