Search for dissertations about: "tight-binding"

Showing result 1 - 5 of 37 swedish dissertations containing the word tight-binding.

  1. 1. Tight-binding calculations of electron scattering rates in semiconducting zigzag carbon nanotubes

    University dissertation from Sundsvall : Mid Sweden University

    Author : Kannan Thiagarajan; Mittuniversitetet.; [2011]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Tight-binding; carbon nanotubes; electron-phonon scattering; backscattering; forward scattering; NATURAL SCIENCES Physics Condensed matter physics Semiconductor physics; NATURVETENSKAP Fysik Kondenserade materiens fysik Halvledarfysik;

    Abstract : The technological interest in a material depends very much on its electrical, magnetic, optical and/or mechanical properties. In carbon nanotubes the atoms form a cylindrical structure with a diameter of the order 1 nm, but the nanotubes can be up to several hundred micrometers in length. READ MORE

  2. 2. Theoretical studies on one-, two- and three-dimensional carbon structures

    University dissertation from Linköping : Linköpings universitet

    Author : Mattias Hjort; Linköpings universitet.; Linköpings universitet.; [2000]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Tight binding; Hückel; Fullerenes; graphite; Anderson localization; transfer matrix;

    Abstract : This thesis deals with electronic structure calculations in large carbon based materials, Especially graphite like structures have been studied. For this the tight binding method together with more sophisticated quantum chemical methods has been utilised. READ MORE

  3. 3. Topological band theory and Majorana fermions With focus on self-consistent lattice models

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Kristofer Björnson; Uppsala universitet.; [2016]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Topology; Majorana; superconductivity; material physics; numerical calculations; tight-binding; mean-field;

    Abstract : One of the most central concepts in condensed matter physics is the electronic band structure. Although band theory was established more than 80 years ago, recent developments have led to new insights that are formulated in the framework of topological band theory. READ MORE

  4. 4. Quantum Transport Theory in Graphene

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Anders Bergvall; [2014]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; quantum coherent electron transport; nanoribbons; FT-LDOS; grain boundaries; tight-binding; graphene;

    Abstract : In this thesis, we focus on different aspects of electron transport in nanostructured graphene (such as graphene nanoribbons). Wedevelop and implement numerical methods to study quantum coherent electron transport on an atomistic level, complemented by analytical calculations based on the Dirac approximation valid close to the points $\vec{K}$ and $\vec{K}^\prime$ in the graphene Brillouin zone. READ MORE

  5. 5. Computational studies of graphene and single walled carbon nanotube growth and carbonaceous polymeric nanocomposites

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Shayesteh Haghighatpanah; [2013]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Graphene; functionalization; carbon nanotube; Monte Carlo; tight binding; polyacrylonitrile; polyethylene; molecular mechanics; molecular dynamics.;

    Abstract : Graphene and single walled carbon nanotube (SWNT) has attracted a lot of attention in different fields of science due to its unique electrical, mechanical, and optical properties. Controlling the growth of graphene and SWNT is a very topical subject and critical for producing material with desired properties since their properties are highly dependent on their atomic structure and it is often desirable that the material contains very few or (if possible) no defects. READ MORE