Browsing School of Physics by Title
Now showing items 2048-2067 of 2099
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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 ... -
Vortex state in ferromagnetic nanoparticles
(2014)The evolution of the magnetic state of a soft ferromagnetic nanoparticle with its size is usually thought to be from superparamagnetic single domain to blocked single domain to a blocked multidomain structure. Néel pointed ... -
Vortex states in soft magnets in two and three dimensions
(2010)The magnetization curves of arrays of near-spherical soft ferromagnetic particles are compared with those of quasi-two-dimensional dots with similar radius prepared by a rapid e-beam lithographic technique. Curves for the ... -
Vortex states of a disordered quantum Hall bilayer
(2009)We present and solve a model for the vortex configuration of a disordered quantum Hall bilayer in the limit of strong and smooth disorder. We argue that there is a characteristic disorder strength below which vortices will ... -
Wall slip of bubbles in foams
(American Institute of Physics, 2006)We present a computational analysis of the flow of liquid foam along a smooth wall, as encountered in the transport of foams in vessels and pipes. We concentrate on the slip of the bubbles at the wall and present some ... -
Wannier-function-based constrained DFT with nonorthogonality-correcting Pulay forces in application to the reorganization effects in graphene-adsorbed pentacene
(2018)Pulay terms arise in the Hellmann-Feynman forces in electronic-structure calculations when one employs a basis set made of localized orbitals that move with their host atoms. If the total energy of the system depends on a ... -
Water vapor on Betelgeuse as revealed by TEXES high-resolution 12 micron spectra
(American Astronomical Society, 2006)The outer atmosphere of the M supergiant Betelgeuse is puzzling. Published observations of different kinds have shed light on different aspects of the atmosphere, but no unified picture has emerged. They have shown, for ...
