Browsing Physics by Title
Now showing items 1568-1587 of 2105
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Quantised conductance in a contact between metallic oxide crystals
(American Physical Society, 1998)The conductance of a point contact between two crystals of metallic (La0.75Sr0.25)MnO3 shows steps as the contact is broken. A histogram of the conductance values observed in 60 breaks exhibits a series of sharp peaks at ... -
Quantitative comparison of ultracentrifuged and diluted single walled nanotube
(2009)We have carried out a quantitative comparison of the dispersion quality for ultracentrifuged and diluted surfactant-stabilised single walled nanotube dispersions. We have characterised these dispersions at a set concentration ... -
Quantitative determination of the adsorption site of the OH radicals in the H2O/Si(100) system
(2002)Using scanned-energy mode photoelectron diffraction from the O 1s level, the local structure around the adsorbed OH species resulting from the interaction of H2O with a Si(100)(2 ? 1) has been determined, by a combination ... -
Quantitative interpretation of the transition voltages in gold-poly(phenylene) thiol-gold molecular junctions
(2013)The transition voltage of three different asymmetric Au/poly(phenylene) thiol/Au molecular junctions in which the central molecule is either benzene thiol, biphenyl thiol, or terphenyl thiol is investigated by first-principles ... -
Quantitative, Label-Free Detection of the Aggregation of alpha-Synuclein Using Microcantilever Arrays Operated in a Liquid Environment
(2012)Early detection of protein aggregation is of great importance in the field of neurodegenerative diseases. The successful detection of the aggregation of the protein ?-synuclein in a quantitative, label-free manner by ... -
Quantized conductance in a contact between metallic oxide crystals
(American Physical Society, 1998)The conductance of a point contact between two crystals of metallic (La0.75Sr0.25)MnO3 shows steps as the contact is broken. A histogram of the conductance values observed in 60 breaks exhibits a series of sharp peaks at ... -
Quantum coherence and ergotropy
(2020)Constraints on work extraction are fundamental to our operational understanding of the thermodynamics of both classical and quantum systems. In the quantum setting, finite-time control operations typically generate coherence ... -
Quantum condensation from a tailored exciton population in a microcavity
(2009)An experiment is proposed on the coherent quantum dynamics of a semiconductor microcavity containing quantum dots. Modeling the experiment using a generalized Dicke model, we show that a tailored excitation pulse can ... -
Quantum conductance of a single magnetic atom: An ab initio study
(2010)Our ab initio study explains recent puzzling experiments on the conductance of a single Co adatom depos- ited either on Cu 111 or on ferromagnetic Co islands and contacted with both magnetic and nonmagnetic electrodes N. ... -
Quantum control of excitons for reversible heat transfer
(2019)Lasers, photovoltaics, and thermoelectrically-pumped light emitting diodes are thermodynamic machines which use excitons (electron-hole pairs) as the working medium. The heat transfers in such devices are highly irreversible, ... -
Quantum Control of Thermodynamic Processes in Semiconductors
(Trinity College Dublin. School of Physics. Discipline of Physics, 2022)In this thesis, we explore theoretically the thermodynamics of heat exchange in laser driven solid state systems. In particular, we focus on the heat exchanged between phonons and a semiconductor quantum dot exciton, driven ... -
Quantum corrections to the Ising interactions in LiYxHo1-xF4
(Springer, 2008)We systematically derive an effective Hamiltonian for the dipolar magnet LiY1?xHoxF4, including quantum corrections which arise from the transverse dipolar and hyperfine interactions. These corrections are derived using ... -
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 ... -
Quantum ratchets with few bands below the barrier
(American Physical Society, 2002)We investigate directed motion in nonadiabatically rocked ratchet systems sustaining few bands below the barrier. Upon restricting the dynamics to the lowest M bands, the total system-plus-bath Hamiltonian is mapped onto ... -
Quantum theory of multimode exciton-polariton Bose-Einstein Condensation
(Trinity College (Dublin, Ireland). School of Physics, 2013) -
Quantum theory of multimode polariton condensation
(2014)We develop a theory for the dynamics of the density matrix describing a multimode polariton condensate. In such a condensate several single-particle orbitals become highly occupied, due to stimulated scattering from reservoirs ... -
Quantum transport in 2D materials: Theoretical and computational optimisation of large heterostructures with spintronics properties
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)Graphene is a monolayer of carbon atoms arranged in a hexagonal lattice, making it the thinnest and strongest material known to man. Its exceptional electronic and thermal properties have generated great interest for its ... -
Quantum transport of Au-S-S-Au nanoscale junctions
(2012)Transport in S2 molecules sandwiched between Au electrodes is investigated with a combination of density functional theory and the non-equilibrium Green?s function method. We consider four different configurations and find ... -
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 ... -
Quasi-Periodic Pulsations in Solar Flares and the Earth's Ionosphere
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)Solar flares are the most powerful and energetic physical phenomena in our solar system, releasing radiation across the whole electromagnetic spectrum with total energies reaching on the order of 10^25 in a matter of ...