Browsing School of Physics by Title
Now showing items 2047-2066 of 2104
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Using chronoamperometry to rapidly measure and quantitatively analyse rate-performance in battery electrodes
(2020)For battery electrodes, measured capacity decays as charge/discharge current is increased. Such rate-performance is usually characterised via galvanostatic charge-discharge measurements, experiments which are very slow, ... -
Using steps at the Si-SiO2 interface to test simple bond models of the optical second-harmonic response
(2007)A simple bond model of the optical second-harmonic (SH) response from interfaces, which assumes a single axial component for each bond, is tested by comparing the response from different step structures at the Si?SiO2 ... -
Using surface and interface optics to probe the capping, with amorphous Si, of Au atom chains grown on vicinal Si(111)
(2009)The distinct optical signatures of aligned single and double Au atom chain structures, grown on vicinal Si(111) substrates, have been identified using reflectance anisotropy spectroscopy (RAS). Deposition of 0.04 monolayers ... -
Using Weakly Supervised Deep Learning to Classify and Segment Single-Molecule Break-Junction Conductance Traces
(2021)In order to design molecular electronic devices with high performance and stability, it is crucial to understand their structure-to-property relationships. Single-molecule break junction measurements yield a large number ... -
Using Your Beam Efficiently: Reducing Electron Dose in the STEM via Flyback Compensation
(2022)In the scanning transmission electron microscope, fast-scanning and frame-averaging are two widely used approaches for reducing electron-beam damage and increasing image signal noise ratio which require no additional ... -
Utilising Chromium-Based p-Type Transparent Conducting Oxides in Photovoltaic Devices
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)This thesis deals with the growth of modern, highly performing p-type transparent conducting oxides and their utilisation in two types of photovoltaic devices. X-ray spectroscopic techniques are used to understand the ... -
Vacancies, interstitials and close Frenkel Pairs on the zinc sublattice of ZnSe
(American Physical Society, 1996)Zinc vacancies (VZn), zinc interstitials (Zni), and ~25 distinct VZn?Zni Frenkel pairs of different lattice separations are observed in ZnSe by the optical detection of magnetic resonance in photoluminescence after 2.5 MeV ... -
Variable range of the RKKY interaction in edged graphene
(2014)The indirect exchange interaction is one of the key factors in determining the overall alignment of magnetic impurities embedded in metallic host materials. In this work we examine the range of this interaction in ... -
Variation of average coordination number with liquid fraction for two-dimensional foams with finite contact angle
(2021)We present Surface Evolver computer simulations for two-dimensional (2d) foams in which the contact angle at which liquid films and Plateau borders meet is non-zero. We determine the average coordination number Z of bubbles ... -
Variation of the electronic functionality of self-seeded germanium nanowires through synthesis determined core-shell interface states
(Trinity College (Dublin, Ireland). School of Physics, 2015)Bottom up grown germanium nanowires may have an important role to play in future electronic devices. While the electrical properties of nanowires grown using a metallic seed as a catalyst have been extensively reported we ... -
A variational pseudo-self-interaction correction approach: ab-initio description of correlated oxides and molecules
(2011)We present a fully variational generalization of the pseudo self-interaction correction (VPSIC) approach previously presented in two implementations based on plane-waves and atomic orbital basis set, known as PSIC and ASIC, ... -
Variational pseudo-self-interaction-corrected density functional approach to the ab initio description of correlated solids and molecules
(2011)We present a variational pseudo self-interaction correction density functional approach (VPSIC) to the ab initio theoretical description of correlated solids and molecules. The approach generalizes previous nonvariational ... -
Vector vibrating-sample magnetometer with permanent magnet flux source
(2006)A compact magnetometer, which uses two nested 1?T Halbach cylinders to generate a variable magnetic field of up to 2?T in any direction in the xy plane, has two sets of quadrupole pickup coils to detect the components mx ... -
Very low 1/f barrier noise in sputtered MgO magnetic tunnel junctions with high tunneling magnetoresistance
(2012)Low frequency 1/f barrier noise has been investigated in sputtered MgO magnetic tunnel junctions(MTJs) with a tunnelingmagnetoresistance ratio of up to 330% at room temperature. The lowest normalized noise parameter ? of ... -
Very thin transparent, conductive carbon nanotube films on flexible substrates
(2010)We investigate the morphological, electrical, and optical properties of carbon nanotube thin films, focusing on films with transmittance, T > 90%. For films with T approximate to 90% we measure sheet resistance of R-s<400 ... -
Vibron-assisted spin relaxation at a metal/organic interface
(2015)Inspired by recent experiments for hybrid organic-ferromagnet interfaces, we propose a spin-relaxation mechanism which does not depend on either the spin-orbit or the hyperfine interaction. This takes place when a molecule ... -
VirE2: A Unique ssDNA Compacting Molecular Machine
(2008)The translocation of single-stranded DNA (ssDNA) across membranes of two cells is a fundamental biological process occurring in both bacterial conjugation and Agrobacterium pathogenesis. Whereas bacterial conjugation spreads ... -
Viscoelastic Polymer Nanocomposites for Strain Sensing Applications
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)Strain sensors are a technology that have developed in parallel with the major milestones in material science over the last century. Most recently, the field of 2D materials has proven to have found a wide range of ... -
Visible light scattering from micron scale silicon nitride structures
(Trinity College (Dublin, Ireland). School of Physics, 2012)Light scattering from complex and irregular shapes is responsible for many optical effects in nature. Butterfly wings change colour when viewed from different angles, due to a complex nanoscale scattering structure. Ice ... -
Visualizing the Mott transition
(2012)Correlated electronic systems involve strong short-range repulsion. At integer filling, the primary effect of correlation is the emergence of an insulating state where band theory predicts a metal. Understanding the ...
