Electronic Transport In Hybrid Contact Of Doubly-stacked Graphene Nanoribbons

Graphene is a two dimensional carbon crystal with only one atomic thickness, which has large variety of physical properties and thus is an ideal material for theoretical and experimental research. It has the potential application as a substitute for silicon in electronics. Therefore, the investigation on quantum transport in graphene is one topic of condensed matter physics. At present, hybrids multilayer exist in experimentally fabricated large-scale graphene. It is important to explore the electronic transport in hybrids multilayer graphene for applications. In the present of electric field and strain effect, we systematiclly studied the electronic transport in the hybrid graphene nanoribbon structures based on a tight-binding approach and the Green’s function method. This thesis is organized as follows:In the first chapter, a brief description of the current research status and the basic problem about the graphene’s structures, fabrication, properties and applications is introduced.The second chapter introduces the basic tight-binding approach and Green’s function formalism.In chapter3, using the Green’s function method, we study the transmission of zigzag graphene nanoribbons hybrid structure in detail. It shows that the next nearest neighbor interlayer coupling in the bilayer regime, the size of hybridized length and the electric field between the top and low layer have a significant effect on the transmission spectrum. We also explore the conduction mechanism.In chapter4, based on the Green’s function, we systematically investigate the electron transport in armchair graphene hybrid structures. The size effect of hybrid bilayer regime and the strain effect have been taken into account. Some interesting results have been obtained.Finally the main work of this paper is summarized, and the prospect of development work is also included.