School of Physics: Recent submissions
Now showing items 361-380 of 2200
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High-throughput bandstructure simulations of van der Waals hetero-bilayers formed by 1T and 2H monolayers
(2021)Vertically stacked van der Waals heterostructures made of two-dimensional compounds are almost an infinite playground for the fabrication of nano-engineered materials for the most diverse applications. Unfortunately, ... -
Ballistic vs diffusive low-frequency scaling in the XXZ and a locally perturbed XXZ chain
(2020)We study the matrix elements of local operators in the eigenstates of the integrable XXZ chain and of the quantum-chaotic model obtained by locally perturbing the XXZ chain with a magnetic impurity. We show that, at ... -
The Limit of Spin Lifetime in Solid-State Electronic Spins
(2020)The development of spin qubits for quantum technologies requires their protection from the main source of finite-temperature decoherence: atomic vibrations. Here we eliminate one of the main barriers to the progress in ... -
Quasiperiodic quantum heat engines with a mobility edge
(2020)Steady-state thermoelectric machines convert heat into work by driving a thermally generated charge current against a voltage gradient. In this work, we propose a new class of steady-state heat engines operating in the ... -
A New Highly Anisotropic Rh-Based Heusler Compound for Magnetic Recording
(2020)The development of high-density magnetic recording media is limited by superparamagnetism in very small ferromagnetic crystals. Hard magnetic materials with strong perpendicular anisotropy offer stability and high recording ... -
Thermodynamics of precision in quantum nonequilibrium steady states
(2019)Autonomous engines operating at the nanoscale can be prone to deleterious fluctuations in the heat and particle currents. Thermodynamic uncertainty relations (TURs) express a fundamental lower bound which translates a ... -
Non-destructive in-situ thermometry of a cold gas via rephrasing impurities
(2020)The precise measurement of low temperatures is a challenging, important and fundamental task for quantum science. In particular, non-destructive in-situ thermometry is highly desirable for cold atomic systems due to their ... -
Quantum work statistics and resource theories: Bridging the gap through Rényi divergences
(2019)The work performed on or extracted from a nonautonomous quantum system described by means of a two-point projective-measurement approach is a stochastic variable. We show that the cumulant generating function of work can ... -
Out of equilibrium thermodynamics of quantum harmonic chains
(2019)The thermodynamic implications for the out-of-equilibrium dynamics of quantum systems are to date largely unexplored, especially for quantum many-body systems. In this paper we investigate the paradigmatic case of an array ... -
Tensor-network method to simulate strongly interacting quantum thermal machines
(2020)We present a methodology to simulate the quantum thermodynamics of thermal machines which are built from an interacting working medium in contact with fermionic reservoirs at a fixed temperature and chemical potential. Our ... -
Perspective and Prospects for Rare Earth Permanent Magnets
(2020)Rare earth permanent magnets constitute a mature technology, but the shock of the 2011 rare earth crisis led to the re-evaluation of many ideas from the 1980s and 1990s about possible new hard magnets containing little or ... -
Photovoltage from ferroelectric domain walls in BiFeO3
(2020)We calculate the component of the photovoltage in bismuth ferrite that is generated by ferroelectric domain walls, using first-principles methods, in order to compare its magnitude to the experimentally measured photovoltage. ... -
Pushing the limits of atomistic simulations towards ultra-high temperature: A machine-learning force field for ZrB2
(2020)Determining thermal and physical quantities across a broad temperature domain, especially up to the ultra-high temperature region, is a formidable theoretical and experimental challenge. At the same time it is essential ... -
Multiple spin?phonon relaxation pathways in a Kramer single-ion magnet
(2020)We present a first-principles investigation of spin-phonon relaxation in a molecular crystal of Co2+ single-ion magnets. Our study combines electronic structure calculations with machine-learning force fields and unravels ... -
Properties of lightweight fibrous materials made using a foam-forming technique
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)This thesis concerns the production and characterisation of foam-formed fibrous materials made from wood, peat fibres and spent grain. Such materials might find commercial applications for insulating purposes when produced ... -
Spin-dependent photoconductivity in CVD- and MBE-grown silicon-on-sapphire
(1995)Spin-dependent photoconductivity is observed in (100) silicon films grown on sapphire by CVD and MBE. The CVD films are either in their as-grown state or have undergone single or double solid-phase epitaxial regrowth. For ... -
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 ... -
Direct Imaging of Charge Redistribution due to Bonding at Atomic Resolution via Electron Ptychography
(2019)Phase imaging in electron microscopy is sensitive to the local potential including charge redistribution from bonding. We demonstrate that electron ptychography provides the necessary sensitivity to detect this subtle ... -
Label-free screening of biochemical changes in macrophage-like cells following MoS2 exposure using Raman micro-spectroscopy
(2021)The emergence of large scale production techniques for 2D particulate materials has dramatically increased their applications potential. Understanding the interactions of biological cells with such particulate material is ... -
On the relationship between morphology and conductivity in nanosheet networks
(2021)It is well-known that the morphology of nanostructured networks is closely linked to network properties. However, controlling and characterizing the morphology of networks of 2D nanosheets has not been explored. In this ...
