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 21 for “"Low temperature measurements"”.
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Low -Frequency 1/F Noise: Low Temperature Measurements and Effect on Superconducting Qubit Dephasing
Low-frequency noise caused by critical-current fluctuations in Josephson junctions can lead to substantial, measurement-induced dephasing in superconducting qubits. The purpose of this work is to measure this noise as a function of temperature and to simulate its effect on the measurement dynamics …
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Low-frequency 1/f noise : low temperature measurements and effect on superconducting qubit dephasing
Low-frequency noise caused by critical-current fluctuations in Josephson junctions can lead to substantial, measurement-induced dephasing in superconducting qubits. The purpose of this work is to measure this noise as a function of temperature and to simulate its effect on the measurement dynamics …
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Optical absorption of bismuth silicon oxide (Bi₁₂SiO₂₀) crystals
… transitions responsible for absorption. Optical measurements were taken in the range of 0.4 - 11 pm at 300 K and 77 K using a spectrometer. The results show that near the band edge, there is evidence of indirect transitions at 2.3 eV and excition transitions at 1.8 eV. Low temperature …
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The effect of neutron irradiation on the density of low-energy excitations in vitreous silica
Systematic low-temperature measurements of the thermal conductivity, specific heat, dielectric constant, and temperature-dependent ultrasound velocity have been made on a single piece of vitreous silica. These measurements were repeated after fast neutron irradiation of the material. It was found …
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Thermal transport across interfaces with molecular layers
… (TA) is used to probe the evolution of Au temperature following abrupt heating by an optical pulse. I modeled the heat transfer from the Au nanocrystals into the molecular coating and then to the substrate and I obtained the values of interfacial thermal conductance of Au/cetyl …
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Low temperature bulk modulus of solid argon
… measured as a function of pressure at constant temperature using a high precision back-reflection X-ray camera. Low temperature measurements, using helium as the pressure transmitting fluid, are reported which cover the pressure range of 10 to 300 bar. These measurements, which are the first …
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Multimode Circuit Quantum Electrodynamics With Superconducting Metamaterial Resonators
… are typically operated, as well as a bandgap at lower frequencies that extends down to dc. In this thesis, we present a brief review of the design, fabrication, and circuit properties of superconducting metamaterial resonators. Through a series of low-temperature measurements, we study the …
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Low Temperature Behavior of Potassium and Sodium-Silicate Glasses
The low-temperature properties of a system of well characterized potassium and sodium silicate glasses have been measured in an effort to better understand the nature of the low-energy excitations which exist in all glasses and to further investigate relationships between the low-temperature …
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On the Typical and Average Contributions to the Persistent Current in Mesoscopic Rings
Low-temperature measurements of the magnetic response of one or more electrically-isolated, micron-sized metallic rings yield an unexpected yet unequivocal result: the presence of equilibrium <i>persistent</i> currents, with nanoampere-sized amplitudes and either <i>h/e</i>- or …
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Surface states on the cleaved (III) silicon surface
… parallel to the cleavage plane over various temperature ranges for gold dope~ and high.resistivity boron doped silicon. The resulting change of conductivity is related to the difference between the valence band edge and the Fermi level in the bulk and at the surface, and to the quantity of …
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Mapping the magnetization density near magnetic atoms in copper: Nuclear magnetic resonance studies of CuMn and CuCr
… are used to find the satellites and measure the temperature dependence of their frequency shifts. To identify the shells producing the satellites, single crystals are necessary. Placing the applied field along three different crystal axes, we use the different symmetries of the shells with …
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ELECTROCHEMICAL SYNTHESIS OF MAGNETIC MATERIALS FOR MAGNETIC RECORDING AND MEMS APPLICATIONS
… bath to provide desirable properties like low stress, low coercivity and fine grain size to the deposit. The effect of saccharin incorporation during electrodeposition process on the properties of CoFe films is studied in this research. In-situ stress measurements were performed to …
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A nanoscale probe of the quasiparticle band structure for two dimensional electron systems
… conductivity and surface state robustness. At low momentum, we find a crossover in the single particle behavior from massless Dirac to massive Rashba character - a unique signature of topological surface states. In the second part of this thesis, we report on the spectroscopic study of charge …
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Growth and Characterization of Epitaxial Oxide Thin Films
… by reactive magnetron sputtering at various temperatures on single crystal SrTiO3 (100) and R-sapphire substrates. X-ray diffraction studies showed that the optimised films were highly (001) oriented, quality of epitaxy improving with decreasing deposition temperature. AFM studies revealed …
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HfO2 as gate dielectric on Si and Ge substrate
… by various techniques. Many of them require high temperature annealing that can impact device performance and reliability. In this research, electrical characteristics of capacitors with HfO_2 as gate dielectric deposited by standard thermal evaporation and e-beam evaporation on Si and Ge …
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Cooling an electron gas using quantum dot based electronic refrigeration
… quantum wires and quantum dots. Conventionally, low temperature measurements of 2DEGs are made by cooling the sample to 1.5 K with liquid Helium-4, to 300 mK with liquid Helium-3, or even down to a few mK using a dilution refrigerator. However, at lower temperatures the electron gas becomes …
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Topological Insulators Interfaced with Trivial and Ferromagnetic Insulators. Selective contact and patterning of surface states.
… methods of fabricating TI devices which can allow characterisation and control of topological surface states. First, different etching techniques are compared on TI films and the devices are characterised by transport measurements. Next, two types of heterostructures are investigated which …
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Exploring excitations and vibrations in semiconductor nanocrystals through fluorescence and Raman spectroscopy
… time-correlated single photon counting measurements to understand QD photoluminescence lifetime as a function of emission wavelength, and low-frequency Raman spectroscopy to measure acoustic phonons in nanocrystal solids. These two chapters serve as an introduction to the ideas and …
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Studies of Some Co-Ordination Compounds of Iron and Cobalt
… data have shown that this complex contains low spin iron III, This species generates the familiar red coloured tris bipyridyl iron II rapidly when dissolved in water in the presence of light, but is very stable in solutions of concentrated acids. Part II is a study of some aspects of the …
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The modification of graphene band structure by periodic potential perturbation
… which means that graphene FETs will have a very low on/off ratio. Several groups have tried to introduce a band gap in graphene artificially, such as etching graphene into nanoribbons. This thesis suggests the possibility to modify graphene’s band structure from appropriately engineered periodic …
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