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 14 of 14 for “"spin polarisation"”.
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Coherence Effects and Spin Polarisation of Electrons in Electromagnetic Fields
… dynamics. Also, the creation of relativistic spin polarised electron beams is essential for probing spin dependent, fundamental interactions in particle physics. Our aim is to create a numerical code capable of modelling electron spin precession, while also predicting the spectrum and angular …
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Theoretical and experimental secondary electron spin polarisation studies and 3D theory of field emission for nanoscale emitters
Spin-polarised electron beams are an invaluable probe of spin-dependent phenomena in fields of atomic and molecular physics, magnetism and biophysics. For this purpose, this work explores both theoretical and experimental aspects of field emission properties of point-like nano-scale emission …
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Point contact studies of rare earth-transition metal compounds
… contact techniques have been used to study the spin-dependent properties of rare earth-transition metal compounds and transition metal thin films and bi-layers. The transport spin polarisation of Cu, Co and Fe has been measured using point contact Andreev reflection (PCAR), and found to be in …
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Preparation and characterisation of magnetic single and double barrier junctions
… temperature dependence, noise in MTJs and spin polarisation of ferromagnetic double layer electrodes. The second experimental chapter investigates MTJs with two tunnel barriers.
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Science and Engineering of Spin Triplet Excitons in Luminescent Molecular Semiconductors
… from OLEDs requires careful management of spin-triplet excitons, which are typically non-emissive. For successful management, the formation and harvesting dynamics of triplet excitons must be probed directly. In this thesis, we employ optical and spin-sensitive probes to reveal the dynamics …
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PROBING BAND MAGNETISM IN DIFFERENT DIMENSIONS: ENERGY, SPIN AND TIME-RESOLVED STUDIES
… address the characterisation of electronic and spin properties of systems with decreasing dimensionality. This programme has been conducted by exploiting state-of-the-art infrastructures to generate visible, UV and EUV ultrashort pulses (tabletop lasers and HHG at NFFA-SPRINT laboratory) and …
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Application of quantum Monte Carlo methods to homogeneous electron and electron-hole systems
… Monte Carlo methods to two model systems: the spin-polarised homogeneous electron gas, and a hole-doped electron gas. Electronic structure theory is briefly reviewed before discussing in more detail the quantum Monte Carlo methods used in this thesis. A study of the three-dimensional …
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Visible Emitters in Hexagonal Boron Nitride as an Optically Addressable Spin Qubit Platform
Optically active spins in solid-state systems serve as excellent spin-photon interfaces, a crucial building block for quantum technologies such as information networks and sensing. This thesis presents a new spin qubit platform: visible emitters embedded in epitaxially grown hexagonal boron nitride …
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Low-dimensional quantum systems
… which incorporates the difference of spin polarisation between molybdenum- and tungsten-based materials. Using the diffusion Monte Carlo method, which is statistically exact for these systems, we extract binding energies of the complexes for a complete set of parameters of the model. …
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Using multiplexers to study the statistics of quantum phenomenon in one-dimensional wires
… $g^*$, which could be beneficial for its use in spintronic applications. Last, we investigate the formation and development of the DC-bias-induced 0.75 and 0.25 anomalies for 402 QPCs. We find the anomalies evolve similarly in a magnetic field. To explain the anomaly behaviours, we propose a …
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Co2MnSi Heusler alloy thin films
… that there is an energy gap in the minority spin band at the Fermi energy. This leads to 100 % spin polarised conduction electrons, which would enable ideal spin-device performance to be obtained. Co2MnSi is particularly promising because it is predicted to have a large energy gap in the …
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Ab Initio Prediction of Metal Phosphide Anode Materials for Lithium and Beyond Lithium Batteries
… I investigate the possible ways to introduce spin polarisation into the search, and determine that breaking the spin state on each atom can be included as a post-processing step of high-throughput searching. Furthermore, the experimental sodiation pathway for FeP$_4$ has not yet been …
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Nachweis der elektrischen Spin-Injektion in II-VI-Halbleiter mittels Messung des elektrischen Widerstandes
Die bisherigen Ergebnisse der elektrischen Spininjektion in Halbleiter im diffusivem Regime werden mit dem Modell von Schmidt et. al gut beschrieben. Eine Folgerung aus diesem Modell ist, dass n-dotierte, verdünnte magnetische Halbleiter ("diluted magnetic semiconductors", DMS) als …