Physics: Recent submissions
Now showing items 321-340 of 2200
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Properties of massive stars before death
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)Despite their importance, there is a lot yet to be learned regarding massive stars, particularly those at late evolutionary stages. In the first of two studies presented here, we investigate a suspected very massive star ... -
Computational and Experimental Study of Optical properties of TiO2 Arrays Fabricated via Soft Nanoimprint Lithography
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)In this thesis the optical properties of large 1 mm2 titanium oxide (TiO2) nanoarrays and the interactions with Rhodamine 6G are studied computationally and experimentally. Three TiO2 arrays with different particle size ... -
Development and Characterisation of a Zero-Moment Half-Metal
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)A dream material for spintronics would have low/zero net moment, no stray fields, high resonance frequency, low damping and be 100 % spin polarised. Such materials combine the best features of a ferromagnet and an ... -
Structural, magnetic, and spin dynamical properties of the polar antiferromagnets Ni3—xCoxTeO6(x=1,2)
(2020)We present results of a multimethod investigation of the polar antiferromagnets Ni2CoTeO6 and NiCo2TeO6, inspired by the colossal magnetoelectric effect present in Ni3TeO6. Both compounds crystalize in the same polar space ... -
Quantum heat statistics with time-evolving matrix product operators
(2021)We present a numerically exact method to compute the full counting statistics of heat transfer in non-Markovian open quantum systems, which is based on the time-evolving matrix product operator algorithm. This approach is ... -
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 ... -
Exfoliating Two-Dimensional Layered Materials: Solvent Interactions from First-Principles
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)Two dimensional materials, such as graphene, MoS2 and hexagonal boron nitride, show wide ranging electronic and mechanical properties which make applications such as transistors, pressure sensors and protective coatings ... -
Surface Studies of Oxidised Metals: Mo, Nb and Cu
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)The atomic structure and evolution of ultra-thin film oxides is investigated for Mo, Nb and Cu using surface sensitive techniques such as scanning tunneling microscopy (STM), scanning tunneling spectroscopy (STS), low ... -
A Simple Model Relating Gauge Factor to Filler Loading in Nanocomposite Strain Sensors
(2021)Conductive nanocomposites are often piezoresistive, displaying significant changes in resistance upon deformation, making them ideal for use as strain and pressure sensors. Such composites typically consist of ductile ... -
Printable G-putty for Frequency and Rate Independent, High Performance Strain Sensors
(2021)While nanocomposite electromechanical sensors are expected to display reasonable conductivity and high sensitivity, little consideration is given to eliminating hysteresis and strain rate/frequency dependence from their ... -
Electrical, Mechanical & Morphological Characterisation of Nanosheet Networks
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)Networks of two-dimensional nanosheets have demonstrated significant promise across a host of applications that span the breadth of materials science. While this has driven research into nanosheet-based devices at a ... -
Quantifying the dependence of battery rate performance on electrode thickness
(2020)Simultaneous optimization of capacity and rate performance in battery electrodes would be much simplified by access to a simple equation relating rate performance to electrode thickness. Although a number of equations have ... -
Machine Learning for Condensed Matter Physics
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)This thesis is about the application of machine learning (ML) methods to a variety of problems in condensed matter physics. As condensed matter physics has large computational and experimental datasets readily available - ... -
Constraining the Presence of Helium in Type Ia Supernovae
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)The aim of this thesis is to investigate the possibility of visible helium features in the near-infrared region of the spectra of Type Ia supernovae, in particular a single feature thought to appear around 10250 ̊A, caused ... -
Spontaneous emission from semiconductor nanocrystals in coupled spherical microcavities
(2005)We report on the coherent coupling of whispering gallery modes (WGM) in a photonic molecule formed from two melamine-formaldehyde spherical microcavities coated with a thin shell of light-emitting CdTe nanocrystals (NCs). ... -
Hybrid organic-inorganic spin-on-glass CuCl films for optoelectronic applications
(2009)Cuprous halides are among the most studied inorganic materials for excitonic related linear/non-linear optical processes due to their large excitonic binding energies (~190 and 108 meV for CuCl and CuBr, respectively). In ... -
Temperature dependent photoluminescence of nanocrystalline γ-CuCl hybrid films
(2014)Organic–inorganic hybrid films combine the basic properties of organic and inorganic materials and offer special advantages that enhance optical, thermal and mechanical properties. We have studied the temperature dependent ... -
Surfing Multiple Conformation-Property Landscapes via Machine Learning: Designing Single-Ion Magnetic Anisotropy
(2020)Computational statistical disciplines, such as machine learning, are leading to a paradigm shift in the way we conceive the design of new compounds, offering a way to directly design the best compound for specific applications. ... -
Energy Current Rectification and Mobility Edges
(2019)We investigate how the presence of a single-particle mobility edge in a system can generate strong energy current rectification. Specifically, we study a quadratic bosonic chain subject to a quasiperiodic potential and ... -
Thermodynamic Uncertainty Relations from Exchange Fluctuation Theorems
(2019)Thermodynamic uncertainty relations (TURs) place strict bounds on the fluctuations of thermodynamic quantities in terms of the associated entropy production. In this Letter, we identify the tightest (and saturable) ...
