Browsing Physics (Theses and Dissertations) by Title
Now showing items 1-20 of 420
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A considered application of the Langreth-Lundqvist van der Waals density functional in the context of : open shell molecules, atom centered basis sets, adsorption of graphene into a Bi₂Se₃ slab
(Trinity College (Dublin, Ireland). School of Physics, 2015)The work in this thesis is aimed towards exploring the edge case application of the Langreth-Lundqvist vdW density functional (vdW-DF). The increasing popularity of the vdW-DF functional has resulted in its application ... -
A dynamic study of cavity polaritons
(Trinity College (Dublin, Ireland). School of Physics, 2002)Strong coupling between an atom and a cavity field is a well established phenomenon in the field of cavity quantum electrodynamics. However it was not until 1992 that improvements in growth technology resulted in the advent ... -
A microcantilever-based, dual-mode, quantitative sensing platform for investigation of biological interactions
(Trinity College (Dublin, Ireland). School of Physics, 2013)Since the introduction of the atomic force microscope (AFM) and the subsequent availability of high-quality cantilevers the interest in the application of microcantilevers as biosensors has increased year-on-year. Much of ... -
A miroscopic and spectroscopic characterisation of nanotube/conjugated polymer interactions
(Trinity College (Dublin, Ireland). School of Physics, 2001)A composite material of a conjugated polymer and carbon nanotubes has been developed. The conjugated polymer is poly (p-phenylenevinylene-co-2,5-dioctyloxy-m-phenylenevinylene) (PmPV), a polymer significant for its ... -
A novel scanning probe micoscopy study of the (110) surface of rutile titanium dioxide
(Trinity College (Dublin, Ireland). School of Physics, 2008)This work describes the application of a novel multi-parameter scanning probe technique to the study of a model semiconductor and a metal oxide surface. Our novel scanning probe technique enables the simultaneous measurement ... -
A search for X-ray flares in the nuclei of galaxies
(Trinity College (Dublin, Ireland). School of Physics, 2003)Observations of the giant elliptical galaxy NCG 4552 at ultraviolet wavelengths during the early 1990’s showed sharply peaked emission within ~2pc of its centre which initially brightened and then faded. The features of ... -
A study of spin polarization in potential half-metals
(Trinity College (Dublin, Ireland). School of Physics, 2006)The study presented in this thesis has been concerned with measuring spin polarisation in magnetic materials using two methods: i) measurement of magnetoresistance in room temperature point contacts and ii) Point Contact ... -
A study of the film growth environment in pulsed laser deposition of gallium nitride
(Trinity College (Dublin, Ireland). School of Physics, 2004)This thesis describes a study of the deposition requirements for growth of stoichiometric GaN thin films using pulsed laser deposition. Growth has been carried out using either ceramic GaN or metal (solid and liquid) Ga ... -
A theoretical study of the strain-modified RKKY interaction in magnetically doped carbon materials
(Trinity College (Dublin, Ireland). School of Physics, 2015)Graphene-related materials continue to be in the scientific limelight due to near-continuous discoveries regarding their properties and production. The applications envisaged for these super materials are numerous and ... -
Ab Initio calculation of parameters for electron and spin transport in organic crystals
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)Organic semiconductors offer several crucial advantages over their inorganic counterparts in electronic and spintronic applications. Besides offering structural advantages such as variety and flexibility, organic semiconductors ... -
Ab-initio study of the electronic and vibrational properties on low-dimensional nanostructures made of layered transition metal di-chalcogenides
(Trinity College (Dublin, Ireland). School of Physics, 2013)The controlled modulation of the electronic and phonon properties of low dimensional materials via external perturbations such as electric fields, doping, and strain, do represent an important step in the development of ... -
Accelerating Materials Discovery with Machine Learning
(Trinity College Dublin. School of Physics. Discipline of Physics, 2024)Materials discovery has always been constrained by the classic approach to scientific discovery, often characterized by a combination of either human intuition or luck. Machine learning (ML) gives us the opportunity to ... -
An electron paramagnetic resonance study of carbon based electronic materials
(Trinity College (Dublin, Ireland). School of Physics, 2000)Electron paramagnetic resonance (EPR) measurements have been made on films of hydrogenated amorphous carbon (a-C: H) and ion implanted 6H-SiC. We examine several sets of a-C: H films. The first and second sets of films ... -
An experimental investigation into the conversion of optical spin to orbital angular momentum using internal conical diffraction
(Trinity College (Dublin, Ireland). School of Physics, 2010)Internal conical refraction (ICR) transforms a ray incident upon the optic axis of a biaxial crystal into a cone of light within the medium and a hollow cylinder of light upon exiting. If the incident ray is circularly ... -
An experimental investigation of metal phthalocyanine-germanium interfaces
(Trinity College (Dublin, Ireland). School of Physics, 2009)Hybrid organic-inorganic devices present interesting possibilities for the growing field of organic semiconductors. The interface within these devices plays an im portant role in their performance, and as they decrease in ... -
An experimental investigation of tunable laser diodes based on multiple etched slots
(Trinity College (Dublin, Ireland). School of Physics, 2010)Widely tunable semiconductor lasers will play a critical part in future technologies. Tunable lasers are rapidly replacing fixed wavelength lasers in dense wavelength division multiplexing (DWDM) optical communications. ... -
An investigation into the effects of magnetic fields on biological cell processes
(Trinity College (Dublin, Ireland). School of Physics, 2011)The application of external magnetic fields to biological cells has received the attention of many researchers in recent decades and there have been countless reports of effects on a myriad of cellular processes. Despite ... -
An X-ray search for active cores in Local Group galaxies
(Trinity College (Dublin, Ireland). School of Physics, 2000)The nuclei of galaxies are sometimes sites of very energetic process, resulting in high levels of electromagnetic radiation being emitted. Such active galactic nuclei (AGNs) are thought to be powered by accretion of mass ... -
Anisotropic magneto-transport properties of epitaxial magnetite thin films
(Trinity College (Dublin, Ireland). School of Physics, 2010)In this thesis we investigate the anisotropic magneto-transport properties of epitaxial Fe304 films grown on MgO substrates. In particular we investigate the angular dependence of the anisotropic niagnetoresistance (AMR), ... -
Applications of statistical physics to economics : distributions of wealth and correlations of financial data
(Trinity College (Dublin, Ireland). School of Physics, 2009)Over the last decade the study of economic and financial problems by the physics community has become very popular. Econophysics describes the application of tools from statistical physics to the study of problems in ...
