Show simple item record

dc.contributor.authorValencia-Hoyos, Daniel A.
dc.description.abstractIntrinsic graphene is the first atomic monolayer structure produced experimentally. Its unique two dimensional geometric structure along with its electronic structure (Dirac cone) make it an ideal system for the fundamental exploration of novel physics as well as a promising candidate for nanoelectronic applications. In this thesis, we present theoretical studies on electronic transport properties of different graphene structures, including monolayers, bilayers, mono-bilayers and junctions between mono-bilayers and monolayers. These structures can be viewed as a graphene monolayer covered by another layer of different width. Their transport properties are calculated by the Landauer- Buttiker formalism combined with density functional theory. Our results show that, in such a structure, the electronic transport property of the graphene monolayer can be changed considerably if the other layer is a nanoribbon with finite width; however the change is less significant if the other layer is infinite or even semi-infinite. We further show that the difference of the effects between infinite and finite coverage can be attributed to antiresonance in the electronic transmission, which is caused by interlayer interference between the wavefunctions.en_US
dc.description.abstractGrafeno es de lejos la primera estructura mono-átomica fabricada en el laboratorio. Esta única estructura bidimensional pose una estructura electronica (Cono de Dirac) que hace de esta un sistema, ideal para exploración en física básica y un prominente candidato para aplicaciones en nano electronica. En esta tesis se hizo un estudio teórico de las propiedades de transporte electrónico para diferentes estructuras de grafeno como grafeno monocapa, bicapa y aleaciones de grafeno monobicapa. Estas estructuras pueden ser consideradas como configuraciones de monocapas de grafeno con un recubrimiento de otra capa de diferentes anchos. En nuestro estudio las propiedad de transporte fueron calculada combinando el formalismo de Landauer-Buttiker con “Density Functional Theory”. Nuestros resultados muestran que las propiedades electrónicas de transporte en una monocapa de grafeno pueden ser cambiadas considerablemente cuando se añade una capa de ancho finito; sin embargo el efecto es menor cuando el recubriniento es infinito or semi infinitamento. Este redución en la transmisión electronica es atribuido a fenómenos de antiresonancia entre las funciones de onda de ambas capas.en_US
dc.titleElectron transport through graphene structuresen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2012 Daniel A. Valencia-Hoyosen_US
dc.contributor.committeeJiménez, Héctor
dc.contributor.committeeRamos, Rafael
dc.contributor.representativeHajek, Darrell W.
dc.contributor.collegeCollege of Arts and Science - Scienceen_US
dc.contributor.departmentDepartment of Physicsen_US
dc.description.graduationSemesterSummer (3rd semester)en_US

Files in this item


This item appears in the following Collection(s)

  • Theses & Dissertations
    Items included under this collection are theses, dissertations, and project reports submitted as a requirement for completing a degree at UPR-Mayagüez.

Show simple item record