Search for dissertations about: "Ab-initio"

Showing result 1 - 5 of 320 swedish dissertations containing the word Ab-initio.

  1. 1. Ab initio Lattice Dynamics : Hydrogen-dense and Other Materials

    Author : Duck Young Kim; Rajeev Ahuja; Richard Needs; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Density functional theory; Density functional perturbation theory; Hydrogen-dense materials; Phase transition; High pressure; Ab initio lattice dynamics; Superconductivity; Quasi-particle approximation; Physics; Fysik;

    Abstract : This thesis presents a theoretical study of materials under high pressure using ab initio lattice dynamics based on density functional theory and density functional perturbation theory using both super-cell and linear response approach. Ab initio lattice dynamics using super-cell approach is applied to compare our theoretical predictions with experimental findings. READ MORE

  2. 2. Molecular Electronics : Insight from Ab-Initio Transport Simulations

    Author : Jariyanee Prasongkit; Rajeev Ahuja; Magnus Paulsson; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Molecular Electronics; Ab Initio; DNA Sequencing; Nanoscience; Graphene; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Abstract : This thesis presents the theoretical studies of electronic transport in molecular electronic devices. Such devices have been proposed and investigated as a promising new approach that complements conventional silicon-based electronics. READ MORE

  3. 3. Defects and Impurities in CdTe : An ab Initio Study

    Author : Anna Lindström; Mattias Klintenerg; Susanne Mirbt; Biplab Sanyal; Peter Zahn; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Native defects; Compensation mechanisms; Semiconductor doping; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Abstract : In this thesis defects and impurities in CdTe have been studied with ab initio methods. CdTe is a II-VI semiconductor with many important applications such as γ- and X-ray detectors, solar cells and medical imaging. READ MORE

  4. 4. Exploring magnetocaloric materials by ab-initio methods

    Author : Rafael Martinho Vieira; Heike C. Herper; Torbjörn Björkman; Olle Eriksson; Markus Gruner; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; magnetocaloric; magnetism; ab-initio;

    Abstract : This thesis explores the characterization of magnetocaloric materials from first-principles calculations, emphasizing entropy variation associated with the magnetocaloric effect. The study happens in the context of the search for new magnetocaloric materials to be applied in domestic magnetic refrigerators,  as environmentally friendly and energy-efficient alternatives to conventional vapor-compression devices. READ MORE

  5. 5. Ab initio modelling of alkali-ion battery electrolyte properties

    Author : Erlendur Jonsson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Batteries; sodium salts; lithium salts; ab initio; DFT; electrolytes; anions;

    Abstract : Lithium-ion batteries are omnipresent in modern electronics. They can be found in laptops, mobile phones and electric vehicles. READ MORE