Abstract

2-D Semiconductors are novel materials in the field of nano-electronics. Their unusual transport properties have led to an extensive research attention towards similar materials. Graphene has carriers that exhibit an effective "speed of light" (106 m/s) in the low energy range of

This research proposes to achieve a common energy dispersion model for different hybridized structures, using tight binding theory. The goal is to achieve a suitable starting point to obtain practical electronic transport calculations for complex atomic structures. We begin with analyzing the electronic properties by obtaining the analytic solution of the wave function, from the Schrödinger equation. We obtain the energy dispersion relation by solving the Hamiltonian. Construction of the Hamiltonian matrix is the most crucial step in this process and the matrix elements are derived using nearest neighbor (NN) interactions. From thereon, methods to solve the Hamiltonian matrices mathematically and MATLAB codes to achieve them are discussed.

In this research, we explore the electronic and quantum transport properties with the help of a common model that works across sp2 and sp3d hybridized atomic orbitals. We specifically deal with 2-D materials like Graphene Nano-Ribbons (GNR) and Molybdenum Disulfide (MoS2). The width/layer-tunable band-gap of these materials is favorable to a variety of modern day applications. A variety of external factors are also known to vary the electronic properties of these materials, like - electric and magnetic fields, external pressure, temperature, strain, etc. Considering spin-orbit coupling, leads to valley physics and coupled spin in monolayers, makes it possible to control the spin and valley correspondingly. These factors are not accounted for in the current model and can build build upon as extensions. The effect of adding layers in Graphene and MoS2 is a avenue for future scope and research.

Library of Congress Subject Headings

Nanoelectronics; Semiconductors--Materials; Graphene--Electric properties

Publication Date

6-2016

Document Type

Thesis

Student Type

Graduate

Degree Name

Electrical Engineering (MS)

Department, Program, or Center

Electrical Engineering (KGCOE)

Advisor

Sean Rommel

Advisor/Committee Member

Santosh Kurinec

Advisor/Committee Member

Jing Zhang

Comments

Physical copy available from RIT's Wallace Library at QD341.H9 V35 2016

Campus

RIT – Main Campus

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