Article
Suppressed conductance in a metallic graphene nanojunction
National Laboratory of Superhard Materials, Department of Physics, Jilin University, Changchun 130023, China
Journal of Applied Physics (Impact Factor: 2.21). 02/2009; DOI: 10.1063/1.3054449 Source: IEEE Xplore

Article: Nonequilibrium Green’s function techniques in current–voltage calculations of nanoscale materials
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ABSTRACT: Based on the nearestneighbor tightbinding approximation, we present exact analytical expressions for electron transmission in nanotube/ribbon junctions, generated by incomplete unzipping of zigzag nanotubes. By assuming onedimerline difference in the widths of the leads, it is demonstrated that such a contact exhibits zero backscattering of lowenergy electrons entering from the graphene side of the junction. We also show that a zigzag nanotube section sandwiched between two armchair graphene ribbons is completely transparent for incident lowenergy electrons. Possible application of the results to nanosensor engineering is also included.Physics of Condensed Matter 01/2010; 77(3):433440. · 1.28 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: Based on the nearestneighbor tightbinding model, we present analytical description of singlemode electron transport through a commonedged junction connecting two semimetal armchair ribbons of different width. The results obtained demonstrate the transmission suppression in the vicinity of the neutrality point except for the junction of the ribbons consisting of 3p1 and 3p+2 dimer lines, p is odd. Unlike other interconnections, this junction is shown to be free of local levels arising at the junction interface and exhibits electron backscattering to be inversely as the square of 2p+1. We also demonstrate that nonzero propagation through a graphene junction can be described by the same relation as that for linear undimerized chain of atoms with one defect bond.Physics of Condensed Matter 01/2009; 72(2):203209. · 1.28 Impact Factor
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