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 13 of 13 for “"phase slip"”.
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Switching Current Distributions of Superconducting Nanowires: Evidence of Quantum Phase Slip Events
Phase slips are topological fluctuation events that carry the superconducting order-parameter field between distinct current carrying states. Owing to these phase slips low-dimensional superconductors acquire electrical resistance. In quasi-one-dimensional nanowires it is well known that at higher …
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Microwave Response in Superconducting Nanowires
… superconducting state as a microwave induced phase slip center (PSC) and study its properties in depth in this dissertation. The jump-wise transition, observed at high bias currents, from the superconducting state into the PSC and the transition from the superconducting state to the normal …
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Resistance in Superconducting Epitaxial Niobium Nanowires
The thermally activated phase slip description of resistance in one-dimensional superconducting wires is unable to explain additional resistance observed in extremely narrow nanowires well below the critical temperature. However, attributing this additional resistance to quantum phase slips has …
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An Nmr Test of Mcmillan's Theory of Incommensurate Charge Density Waves
… by commensurate regions separated by regions of phase slip."
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Theory of Quantum Degenerate Gases
… gas; third, the role of thermally activated ""phase slip"" events in destroying superfluidity near the critical temperature of a Bose gas; fourth, mechanical instabilities in clouds of attractive bosons; fifth, the kinetics of a gas of partially condensed atoms; and sixth, the nonlinear optical …
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Josephson Effects in the Iron-Based Superconductor FeTe$_{1-x}$Se$_{x}$
… which likely arises from flux flow and a phase slip line in FeTe$_{1-x}$Se$_x$. The second signature was the emergence of sudden jumps in the DC current at which Shapiro steps arise, as a function of applied RF power. This was measured by mapping $\frac{dV}{dI}$ vs DC current and RF power. …
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Performance measurements of a flashing flow nozzle
… a uniform bubbly flow. Bubbly flow helps two-phase flows become less metastable, by generating a uniform distribution of bubbles that act as nucleation sites for flashing inception. Low flow metastabilities were found with high inlet qualities and small upstream piping diameters. These …
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Probing quantum phase slips in superconducting nanowires modified using high bias voltage pulses
Quantum phase slips (QPS) or the macroscopic quantum tunneling (MQT) of a nanowire’s order parameter through an activation energy barrier have remained the subject of intense debate for many years. They are expected to occur at low enough temperature where thermally activated phase slips (TAPS) …
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Computational Modeling of Superconductivity from the Set of Time-Dependent Ginzburg-Landau Equations for Advancements in Theory and Applications
… the visualization of the 1-D wire dynamics of phase slip centers (PSCs), the pitchfork bifurcation of PSC locations at varying energy gaps, the influence of phonon flux to the PSC, and the proposed application of a 1-D wire cryocooler from these previous results. The published result of the …
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Magnetic force microscopy studies of mesoscopic superconducting structures
… (SR) of cantilever-driven thermally activated phase slips (TAPS). The SR model allows us to experimentally determine the rate of TAPS and compare it to the Langer-Ambegaokar-McCumber-Halperin (LAMH) theory for TAPS in 1D superconducting structures. Further, we use the SR model to qualitatively …
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Dissipative processes in superconducting nanodevices: nanowire-resonators, shunted nanowires, and graphene proximity junctions
… of macroscopic quantum behavior such as quantum phase slips (QPS), and the potential use of nanowires as qubits. Superconducting coplanar microwave waveguide resonators have also become a popular way of studying superconducting junctions and qubits, as they provide an extremely low noise …
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Macroscopic quantum tunneling in superconducting nanowire devices
… the study of macroscopic quantum tunneling of phase-slips in superconducting devices, including one-dimensional nanowires, quasi-two-dimensional superconducting strips and doubly connected superconducting devices composed of two nanowires connected in parallel. We observe macroscopic quantum …
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Analytical and computational methods for the study of rare event probabilities in dispersive and dissipative waves
… leads to a radiation-induced drift in a pulse's phase, which is largely unaccounted for in the reduced systems currently in use. The first part of this dissertation is devoted to understanding the interaction between a pulse and dispersive radiation, leading to the derivation of an improved …