investigations on transport properties of graphene based bilayer systems

Abstract

Graphene, a one atom thick carbon sheet, has provided an immense boost up and new dimension to material science and nanotechnology due to its eminent features. The latest advances in graphene research have sparked the development of exciting nanoelectronics gadgets comprised of atomically thin materials and graphene. A good example is Graphene based Double Layer System(GDLS). In view of that I carried theoretical investigations on transport properties of graphene based bilayer systems like Monolayer Graphene Double Layer System (MLGDL), Bilayer Graphene Double Layer System (BLGDL) and Graphene based hybrid systems. In some cases, it has been observed that the theoretical model does not match the experimental model, which indicates some missing parameters and may be defects present in the crystal. To check this effect in Graphene heterostructure, I have primarily investigated two types of scatterers: short range scattering and long range scattering in presence some parameter like carrier concentration, mismatch in dielectric, interlayer distance and temperature effect. Screening effect has been carried out within standard approximation called Random Phase Approximation (RPA). Conductivity has been calculated within the framework of Boltzmann Transport theory. newlineThis thesis is organized into five chapters. Chapter 1 is a graphene introduction with properties and applications. Chapter 1 also introduces the methods, like Random newline newlinePhase Approximation (RPA), that will describe the screening and Boltzmann transport theory used to calculate the electrical conductivity of graphene systems. Study on previously reported work and objective of the thesis are reported in Chapter 1. The electronic transport properties of MLGDL, BLGDL, and Graphene based hybrid systems at zero as well as finite temperature are covered in Chapters 2, 3, and 4, respectively. Our primary research has focused on the effects of carrier concentration, interlayer distance, and the dielectric environment on these systems. Finally, in Chapter 5,