Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"spin physics"”.
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Exploring spin physics with ultracold atoms
The dynamics of many interacting spins is an active frontier of research; not only can they explain magnetic phenomena, but they also provide paradigmatic models with deep connections to high-T_c superconductivity, optimization problems, neural networks, and more. Experiments with ultracold alkali …
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Spin Properties of Heavy Holes in Low-Dimensional Quantum Electronic Devices
The rich spin physics in quantum confined holes has attracted significant ongoing research interest for over 20 years. The ability to manipulate the spin degrees of freedom in spin-orbit coupled holes via an electric field has opened up the field of spin-based electronics, or spintronics. In this …
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Feasibility study on extracting the gluon polarization in Di-Jet production in polarized pp collisions at RHIC
… National Laboratory (BNL) is carrying out a spin physics program at is = 200 - 500 GeV to gain a deeper insight into the spin structure and dynamics of the proton. These studies provide fundamental tests of Quantum Chromodynamics (QCD). One of the main objectives of the STAR spin physics …
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Neutral Pion Double Helicity Asymmetry in Polarized Proton-Proton Collisions at [the square root of sigma]=200 GeV at STAR
One of the primary goals of the spin physics program at the STAR experiment is to constrain the polarized gluon distribution function, [delta]g(X,Q²), by measuring the double longitudinal spin asymmetry, ALL, of various final-state channels. Neutral pions provide a potentially powerful final state …
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Modulated Magnetic Field Effects, Molecular Design, and Indigoids: A Mechanistic Study of Singlet Fission
… reveals complex lineshapes describing the spin physics in great detail. ModMPL is a rapid, low-degradation technique, that greatly enhances the screening of new potential materials. In particular, it allows comparison of sample morphologies and their impacts on singlet fission dynamics in a …
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Singlet Fission in Pechmann Dyes and Molecular Oligomers
… to two low-energy triplet excitons through a spin-conserving pathway. When integrated into photovoltaics, singlet fission offers the opportunity to mitigate thermalization losses and possesses the potential to improve single-junction photovoltaic efficiencies, surpassing the Shockley-Queisser …
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Magneto-Optical Effects in Manganese-doped Lead Halide Perovskite
… ions that carry magnetic moment with S = 5/2 spin state into the perovskite host semiconductor. Employing spin resonance and magneto-optical spectroscopy, we find coupling between the dopant’s magnetic moment and the exciton spin of the semiconductor. We report magnetic brightening of a dark …
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Transport spectroscopy of graphene quantum dots fabricated by atomic force microscope nano-lithography
… fields and we try to understand the behaviour of spins in graphene. In our initial investigations into AFML we use graphene samples electrically contacted using standard electron-beam lithography. We were able to cut the graphene lattice by applying a negative voltage to the AFM tip and moving the …
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Initialisation, control and readout of a nuclear-magnon quantum register
… of the system, since a single QD electron spin is coupled to approximately 100,000 nuclear spins. Combining these two elements, we have an isolated many-body nuclear ensemble interfaced to a central, proxy qubit, which we can interrogate optically. The system then plays host to a plethora …
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Quantum transport in mesoscopic systems of Bi and other strongly spin-orbit coupled materials
Systems with strong spin-orbit coupling are of particular interest in solid state physics as an avenue for observing and manipulating spin physics using standard electrical techniques. This dissertation focuses on the characteristics of elemental bismuth (Bi), which exhibits some of the strongest …
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Exploring single hole states in InAs/GaAs quantum dots and quantum dot molecules under 2-D electric fields
… and quantum computing. Specifically, hole spins in a single QD/QDM have longer decoherence time than electron spins due to the lack of hyperfine interaction, making hole spins a great qubit candidate. However, many challenges such as QD growth, device integration, and spin manipulation …
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Spin dynamics of bulk and quasi-two-dimensional metal halide based perovskite semiconductors
… metal halide perovskites. Specifically, of their spin dependencies on lattice and many-body interactions. Many of these results were obtained in close collaboration with others, as specified throughout the dissertation. First, we report that spin-dependent exciton interactions modify the exciton …
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Measurement of transverse spin asymmetries in polarized proton-proton collisions, and the realization of new electromagnetic calorimeters for forward physics
Single transverse spin asymmetries in polarized proton-proton collisions, AN , are extracted at mid-rapidity and at forward-rapidity. The forward-rapidity data is acquired with a pair of electromagnetic calorimeters which were built as part of the thesis. All aspects of the calorimeters from design …
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A tale of two interfaces: photons and spins linked by a solid-state artificial atom
An electron spin confined to a self-assembled quantum dot presents itself as a natural candidate for the node of a quantum network, offering a highly coherent interface between a solid-state spin and an optical photon. Crucial to the construction of such a network will be the exploitation of the …
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Interplay of Spin and Photophysics in Luminescent Open-Shell Molecular Semiconductors
… properties attractive for optoelectronic and spintronic devices. In this thesis, we employ optical and spin-based probes to reveal the dynamics of photogenerated excitons in a selection of novel tris(2,4,6-trichlorophenyl)-methyl (TTM)-based radicals. The first three chapters present a …
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Utilizing Parity Violating Electron Scattering As a Probe to Measure the Neutron Radius of 208-pb
<p>The Lead Radius Experiment 2 (PREX-II) and Calcium Radius Experiment (CREX) carried out in Hall A of the Thomas Jefferson National Accelerator Facility were designed to measure the neutron skins of 208-Pb and 48-Ca nuclei by measuring the parity-violating asymmetry APV of the elastic scattering …
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Studying the Quark Structure of the Proton in High Energy Proton-Proton Collisions at RHIC
… thesis presents the first measurement of single spin asymmetries from inclusive di-hadron production in polarized proton-proton collisions at Relativistic Heavy Ion Collider. This measurement combines the transversity distribution function and a polarized di-hadron fragmentation function, …