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 20 of 32 for “"Electron spins"”.
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Linking confined electron spins through coherent light-matter interaction.
Electron spins confined to self-assembled quantum dots are considered as nodes for a coherent optical network capable of supporting distributed quantum states. Through a series of experiments, the work contributing to this dissertation examines some of the key criteria for constructing such a …
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Quantum Computation With Electron Spins of Phosphorous Donors in Silicon
… during the development of modern microelectronics. In this dissertation we investigate several theoretical aspects of a silicon- based quantum computer in which qubits are represented by the spins of electrons bound to phosphorous donors in silicon. Encoding each qubit in terms of three …
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Photon-mediated entanglement of electron spins in a dynamic solid-state environment
… dots can act as an interface between single spins and photons. They combine the flexibility and scalability of semiconductor systems with near-perfect two level systems, emitting highly coherent single photons. In potential quantum information processing architectures based upon optical …
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Coherent control of electron spins in diamond for quantum information science and quantum sensing
… coherent control techniques to exploit electron spins in diamond for applications in quantum information processing and quantum sensing. Specifically, optically-detected magnetic resonance measurements are performed on quantum states of single and multiple electronic spins associated …
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Optical Control over Nuclear Spins
… is highly desirable. Particularly, nuclear spins have been considered as ideal quantum information carriers thanks to their exceptionally long coherence time exceeding minutes and even hours at room temperature. However, the application of nuclear spins is hindered by their small energy …
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Upper critical magnetic field of superconducting films with magnetic impurities
… of Fulde and MakL This theory assumes that the electron-phonon coupling is weak, and that the interaction between the impurity spins and the conduction electron spins is weak. The theory predicts that the pair-breaking effect of the magnetic impurities is temperature-independent, and that the …
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Determination of the Magnetic Structure of the Antiferromagnetic State of the Organic Superconductor Kappa-(bedt)(2)copper Dicyanamide Chloride Using Nuclear Magnetic Resonance and Magnetometry
… that there is antiferromagnetic ordering of the electron spins in the magnetic state, but the detailed ordering was not understood. Our 13C NMR resonance frequency data in the magnetic state, combined with our analysis of symmetry of the system, show conclusively that the ordering is …
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Determination of the Magnetic Structure of the Antiferromagnetic State of the Organic Superconductor k-(BEDT)2Cu[N(CN)2]Cl Using Nuclear Magnetic Resonance and Magnetometry
… that there is antiferromagnetic ordering of the electron spins in the magnetic state, but the detailed ordering was not understood. Our 13C NMR resonance frequency data in the magnetic state, combined with our analysis of symmetry of the system, show conclusively that the ordering is …
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Engineering coherent control of quantum information in spin systems
… context of magnetic resonance for: (i) nuclear spins of small molecules in solution and (ii) nuclear and electron spins in single crystals. The power of QIP is compromised in the presence of decoherence. One method of protecting information from collective decoherence is to limit the quantum …
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Spin-coherence and -dephasing of donor and free conduction band electrons across the metal-insulator transition in Si:GaAs
… is trying to combine the world of semiconductor electronics and magnetism to overcome disadvantagesof each part on its own. Furthermore, new phenomena and applications associated with them may arise. Although this dissertation deals only with a sub-topic of Spintronics, namely the spin coherence …
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Magnetic susceptibility and knight shift measurements in aluminum-rare earth alloys
… spin and The total orbital angular momentum of f electrons is dominant in determining the size of localized moments on solutes. The maximum magnitude of localized moments observed was over 10ub which is impossible without a contribution to the magnetic moment from orbital angular momentum. The …
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Non-suspended optomechanical cavities
… as an optomechanical interface for coupling electron spins of defect centers in diamond crystal lattice to telecommunication wavelength photons via optomechanically induced strain.
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Europium oxide as a perfect electron spin filter
Essential to the emergence of spin-based electronics is a source of highly polarized electron spins. Conventional ferromagnets have at best a spin polarization P-50%. Europium monoxide is a novel material capable of generating a highly spin-polarized current when used as a tunnel barrier. EuO is …
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Controlling molecules with lasers and lasers with molecules
… spin. In our early work we pursued polarizing electron spins and nuclear spins for NMR Quantum Computation. We studied the electron spin triplet state properties of several molecules. Through this work we recognized that the laser and pulse shaper we were using could be modified to utilize the …
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Dynamic nuclear polarization and electron spin resonance in paramagnetic solids at high field
… DNP transfers the large polarization of unpaired electron spins to nuclei in a process involving sample irradiation at or near the electronic Larmor frequency. Large signal enhancements have been achieved in a nitroxide doped frozen aqueous solution at 5T. The relevant relaxation times governing …
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Chemical Spin Patterning in Metal-Organic Frameworks
… behaviors. In magnets, interactions between electron spins result in emergent properties with profound fundamental and technological implications. As metal-organic-frameworks (MOFs) are highly tailorable materials, this thesis will examine the utilization of MOF platforms to engineer bespoke …
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Terahertz spectroscopy of quantum spin liquids
… exhibit Quantum Spin Liquid behavior, in which electron spins have strong antiferromagnetic interactions, but quantum fluctuations inhibit magnetic order even at 0 K, instead giving way to a Resonating Valence Bond state. Quantum Spin Liquids host exotic fractionalized excitations called …
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Frustrated Magnetism in Strongly Correlated Electron Systems
… excitations in several strongly correlated electron systems, where exotic orderings can be induced as a result of magnetic frustration and quantum fluctuations. We show that emergent spin textures can arise close to a magnetic field-induced quantum critical point, when the single magnon …
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Split gate tunnel barriers in double top gated silicon metal-oxide-semiconductor nanostructures
… in spin-based silicon quantum computers where an electron spin represents a quantum bit (qubit). Spin qubits in silicon are attractive because of their long coherence times due to the weak spin-orbit coupling of silicon and the ability to eliminate background nuclear spins by isotopic enrichment. …
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Growth and characterisation of Niobium/Gadolinium superconductor-ferromagnet nanocomposites
… is the phonon-mediated attraction energy between electrons which results in the formation of the so-called Cooper pairs, is usually smaller that the exchange (Zeeman) interaction between electrons which tend to align the electron spins. However, non-zero total momentum Cooper pairs can be …
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