Browsing School of Physics by Sponsor "Irish Research Council for Science and Engineering Technology (IRCSET)"
Now showing items 1-20 of 35
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Ab initio transport across bismuth selenide surface barriers.
(2014)We investigate the effect of potential barriers in the form of step edges on the scattering properties of Bi2Se3(111) topological surface states by means of large-scale ab initio transport simulations. Our results demonstrate ... -
Andreev reflection in two-dimensional topological insulators with either conserved or broken time-reversal symmetry
(2012)We investigate Andreev reflection in two-dimensional heterojunctions formed by a superconductor in contact with a topological insulator ribbon either possessing or breaking time-reversal symmetry. Both classes of topological ... -
Characterising Complexity in Solar Magnetogram Data using a Wavelet-based Segmentation Method
(2010)The multifractal nature of solar photospheric magnetic structures are studied using the 2D wavelet transform modulus maxima (WTMM) method. This relies on computing partition functions from the wavelet transform skeleton ... -
Comparative study of beam-induced carbonaceous deposits in helium-ion and scanning electron microscopes.
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)In this work, the phenomena of beam-induced contamination in charged beam microscopes (i.e. the scanning electron microscope (SEM) and helium ion microscope (HIM)) was investigated in order to determine its influence on ... -
Constraining Three-Dimensional Magnetic Field Extrapolations Using the Twin Perspectives of STEREO
(2010)The three-dimensional magnetic topology of a solar active region (NOAA 10956) was reconstructed using a linear force-free field extrapolation constrained using the twin perspectives of STEREO. A set of coronal field ... -
Deceleration and dispersion of large-scale coronal bright fronts
(2011)Abstract: Context. One of the most dramatic manifestations of solar activity are large-scale coronal bright fronts (CBFs) observed in extreme ultraviolet (EUV) images of the solar atmosphere. To date, the energetics and ... -
Dense packings of spheres in cylinders: Simulations
(2012)We study the optimal packing of hard spheres in an infinitely long cylinder, using simulated annealing, and compare our results with the analogous problem of packing disks on the unrolled surface of a cylinder. The densest ... -
DMF-exfoliated graphene for electrochemical NADH detection
(2011)The electrochemical detection of NADH is of considerable interest because it is required as a cofactor in a large number of dehydrogenase-based biosensors. However, the presence of oxygenated functionalities on the electrode ... -
Dynamic structural colour using vanadium dioxide thin films
(2018)A thin film stack consisting of layers of indium tin oxide (ITO) with an intermediate vanadium oxide (VO2) layer on an optically thick silver film has been investigated for dynamic structural colour. The structure benefits ... -
Efficient spin injection and giant magnetoresistance in Fe/MoS2/Fe junctions
(2014)We demonstrate giant magnetoresistance in Fe/MoS2/Fe junctions by means of ab initio transport calculations. We show that junctions incorporating either a monolayer or a bilayer of MoS2 are metallic and that Fe acts as an ... -
Electronic structure of graphene beyond the linear dispersion regime
(2011)Among the many interesting features displayed by graphene, one of the most attractive is the simplicity with which its electronic structure can be described. The study of its physical properties is significantly simplified ... -
Energy transfer processes in semiconductor quantum dots: bacteriorhodopsin hybrid system
(2009)The potential impact of nanoscience on energy transfer processes in biomolecules was investigated on the example of a complex between fluorescent semiconductor nanocrystals and photochromic membrane protein. The ... -
Exploring New and Enhanced Optical Functionalities in Coupled Nano-Systems
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)In this thesis, a variety of novel emerging systems were chosen to explore new and enhanced optical functionalities in coupled nano-systems. The coupling of novel nanomaterials with complimentary properties paves the way ... -
The free-electron response in reflectance anisotropy spectra
(2006)Reflectance anisotropy spectra (RAS), extended into the near infrared spectral region, of anisotropic metal islands, metal surfaces, and atomic nanowires are analyzed with respect to anisotropies in the optical response ... -
Imaging and identification of point defects in PtTe2
(2021)The properties and performance of two-dimensional (2D) materials can be greatly affected by point defects. PtTe2, a 2D material that belongs to the group 10 transition metal dichalcogenides, is a type-II Dirac semimetal, ... -
Impact of bias current distribution on the noise figure and power saturation of a multicontact semiconductor optical amplifier
(2011)We present an experimental investigation of a multicontact semiconductor optical amplifier. This first-generation device allows for direct control of the carrier density profile along the length of the waveguide. This is ... -
Increased response/recovery lifetimes and reinforcement of Polyaniline Nanofiber Films using Carbon Nanotubes
(2012)We have prepared high surface area, conductive, mechanically robust, responsive polyaniline-carbon nanotune composite films. These were produced by filtration from dilute dispersions of polyaniline nanofibers and single-walled ... -
Influence of graphene oxide/Ag nanoparticle composites on the fluorescence properties of organic dyes
(2017)Graphene oxide/Ag nanoparticle (AgGO) composite materials have been proposed for surface enhanced Raman scattering (SERS) detection of fluorescent dye molecules. In this study we examine the role of the different components ...