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 54 for “"Disordered systems"”.
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Avalanches in disordered systems
The idea of systems that evolve via avalanches is a simple, yet powerful one. A collection of elements that interact with one another, with each element possessing the ability to change the state of other elements when it undergoes a change. These other newly changed elements may affect yet more, …
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Delocalization phenomena in strongly disordered systems
… we study delocalization mechanisms in strongly disordered systems. We focus on one-dimensional systems where the localizing effects of disorder are strongest. Our explorations of delocalization mechanisms will reveal new insights into the nature of Anderson transitions in the context of the …
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Caging and Transport in Simple Disordered Systems
… the caging and transport of a series of simple disordered systems.</p><p>We first consider the dynamics of site percolation on hypercubic lattices. Using theory and simulations, we obtain that both caging and subdiffusion scale logarithmically for dimension d ≥ d_u, the upper critical dimension …
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Superconductivity in Multi-Band and Disordered Systems
We propose that a clean array 4He atoms is a self-generated Mott insulator, that is, the 4He atoms constitute the lattice as well as the charge carriers. With this assumption, we are able to interpret the textbook defect-driven supersolids as excitations of either the lower or upper Hubbard bands. …
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On the Relaxation Dynamics of Disordered Systems
We investigate the properties of two distinct disordered systems: the two-species predator-prey Lotka-Volterra model with rate variability, and an elastic line model to simulate vortex lines in type-II superconductors. We study the effects of intrinsic demographic variability with inheritance in …
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Understanding Disordered Systems Through Numerical Simulation and Algorithm Development
<p>Disordered systems arise in many physical contexts. Not all matter is uni-</p> <p>form, and impurities or heterogeneities can be modeled by fixed random disor-</p> <p>der. Numerous complex networks also possess fixed disorder, leading to appli-</p> <p>cations in transportation systems [1], …
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Bioinspired scattering materials: light transport in anisotropic, disordered systems
The study of light propagation in disordered media has attracted the interest of many researchers for its relevance to fundamental and applied problems, ranging from imaging through turbid media to the fabrication of white paint. Scattering in a disordered system is determined by the spatial …
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Exact computations in the statistical mechanics of disordered systems
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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Unexpected Universality in Disordered Systems and Modeling Perpendicular Recording Media
In state-of-the-art storage applications such as hard disk drives, the intrinsic switching field distribution of the media grains is one of the most crucial properties defining the recording quality. However, this piece of microscopic information is very hard to measure macroscopically, especially …
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Disordered systems and quantum algorithms: from spin glasses to neural networks
… investigates how quantum algorithms can solve disordered systems, with a focus on spin glasses and neural networks. We first introduce several examples of disordered systems and have an overview of spin glasses. Then we introduce a cyclic quantum annealing protocol on D-Wave’s 5000-qubit …
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High pressure carbon-13 NMR studies of dynamics in disordered systems
… This new technique is used in the study of two disordered systems under extreme conditions of pressure. The first system is 2-ethylhexylbenzoate, a model elastohydrodynamic lubricant. The second system is L-$\alpha$-dipalmitoyl phosphatidylcholine, a model biomembrane system. Also, the design of …
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Entropy functions and rare events in disordered systems by transfer matrix calculations and Monte Carlo sampling
This thesis treats problems from bioinformatics with Monte Carlo methods from statistical physics. Methods to compare molecular sequences (sequence alignment) make use of statistical tests to assess the significance of observed similarities. Distributions of optimal alignment scores over random …
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Phase Transitions in Disordered Systems: I. Exciton/electron-Hole Liquid/plasma System in Germanium and Ii. Amorphous Ferromagnets and Spin Glasses
In Part I of this thesis, we present experimental evidence demonstrating that a metal-insulator (M-I) phase transition can occur separately from the liquid-gas (L-G) transition in the exciton/electron-hole (e-h) gas/e-h liquid system in stressed Ge. Using a strain well to confine the photoexcited …
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Phase transitions in disordered systems: I. exciton/electron-hole liquid/plasma system in germanium and II. amorphous ferromagnets and spin glasses
… that derivprJ hv diagrammatic expansions of the disordered Hamiltonian. Usi.ng this free energy and our calculated distribution of internal fieMs, we show that the BPW met.hcx:1 reproduces all the results of Sf( includinq a negative entropy of -k/(2n) at T =O. We also show by analytical means …
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TOWARDS ULTRACOLD FERMIONS IN 2D DISORDERED OPTICAL LATTICES
… many body phenomena, yet scalable platforms for disordered systems remain challenging. This work presents the development of an experimental platform to investigate quantum many-body physics with ultracold lithium-6 fermions in a two dimensional disordered optical lattice governed by the …
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Localization and spreading of matter waves in disordered potentials
… relevant problems of the physics of quantum disordered systems from a numerical and theoretical point of view, with specific attention to the connection of our findings with ultracold atomic gases experiments. We concentrate on two main issues: the interplay between localization and …
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Low-temperature dielectric response of beta-alumina at 16 GHz
… have been shown to be characteristic of highly disordered systems.
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Structural and electrical characteristics of printed metal nanoparticle networks
… been used to describe the physical properties of disordered systems, as well as providing a link between their structural features and the corresponding electrical transport properties. Silver and palladium nanoparticulate layers in ethyl cellulose polymer binder (ETHOCELTM), were fabricated onto …
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Physical models of protein folding within the energy landscape theory
… using tools from the statistical mechanics of disordered systems, polymers, and phase transitions of finite systems. The theory provides an interpretation of results from fast folding experiments as well as minimalist models used in computer simulations.
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