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A New Type of Structure of the Graphene Nano Device

Author: CaiYuKai
Tutor: WangWei
School: Nanjing University of Posts and Telecommunications
Course: Circuits and Systems
Keywords: Graphene Tight-banding model Green’s function Electronic transport
CLC: TB383.1
Type: Master's thesis
Year: 2012
Downloads: 39
Quote: 0
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Abstract


Graphene, as an ideal realization of two-dimensional crystals, has a promising future due to its unique electronic and physical properties. Owing to the excellent electrical properties and the characteristics that graphene ribbo ns can be cut easily with a designed shape and size, graphene is considered as candidates to make next generation electronic devices.Green’s function expression has been calculated using Green’s function and Landauer-Büttiker formulation in tight-binding approximation. Band structure of graphene has been calculated using Poisson equation and quantum transport equation. Our comprehensive studies on the electronic transport of the ladder-shaped graphene structure and bilayer graphene structure can provide physical insight and guidance for further optimization and theoretical studies of new graphene devices.First, we have demonstrated the band structure and electronic transport properties of two-dimensional and one-dimensional grapheme, and we have calculated the transmission probability through a potential step or a potential barrier in the graphene nonoribbon. Second, the simulated results show that conductance peak of the graphene structures split in 0.0eV as the symmetrical center and decrease until they disappear, with increasing of the ladders. The peaks of conductance will be suppressed with increasing of ladder interval.Finally, we have demonstrated the electronic transport properties of several bilayer graphene structures, which are different shapes and different number of graphene surfaces. The results show that: the single layer structure conductance forms the envelope which is similar to double structure conductance, but the conductivity of discrete features disappear. Conductance peak of the bilayer graphene structure occur split, and conductance peak of the bilayer graphene structure decrease around 0.0eV, with increasing of the uppe r graphene number.

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