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 526 for “"low dimensional"”.
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Low-dimensional quantum systems
We study low-dimensional quantum systems with analytical and computational methods. Firstly, the one-dimensional extended t-V model of fermions with interactions of finite range is investigated. The model exhibits a phase transition between liquid and insulating regimes. We use various analytical …
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Low-Dimensional Reality-Based Algebras
<p>In this paper we introduce the definition of a reality-based algebra (RBA) as well as a subclass of reality-based algebras, table algebras. Using sesquilinear forms, we prove that a reality-based algebra is semisimple. We look at a specific reality-based algebra of dimension 5 and provide …
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LOW-DIMENSIONAL CHALCOGENIDE BASED THERMOELECTRIC COMPOSITES
… the hydrothermal reflux method, a series of low-dimensional chalcogenide nanostructures were designed. On one hand, ternary metal (Bi, Cu, Ag, and Pb) chalcogenide nanowires with high thermoelectric figure of merit and power factors were obtained by using Te1-xSex alloys as templates. On the …
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Superconductivity in low-dimensional Nb nanostructures
L'abstract è presente nell'allegato / the abstract is in the attachment
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Characterizing low-dimensional phenotypes by clustering
A person's height is influenced by many factors, such as her parents' heights and how well she was nourished as a child. The features of an organism that can be seen are called phenotypes. Phenotypes that are influenced by multiple genes or the environment; that have many different features; and …
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Magnetotransport in low dimensional semiconductor structures
This dissertation describes low-temperature electronic transport measurements on semiconductor structures of restricted dimensionality. The experiments fall into two sets. The first concerns anisotropic magnetotransport measurements and electron focusing in a varying external magnetic field. These …
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Thermal transport in low dimensional semiconductor nanostructures
We have performed a first principles density functional theory (DFT) calculations to study the thermal conductivity in ZnO nanotubes, ZnO nanowires, and Si/Ge shell-core nanowires. We found the equilibrium configuration and the electric band structure of each nanostructure using DFT, the …
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Phonon Spectroscopy and Low-Dimensional Electron Systems
… give unique information about the properties of low-dimensional electron systems, but in order to interpret the experiments and to understand the underlying physics, a comparison with theoretical models is absolutely necessary. A central point of this work is therefore a universal theoretical …
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Quasi-condensation in low-dimensional Bose gases
The subject of the present thesis is the one-dimensional Bose gas. Since long-rang order is destroyed by infra-red fluctuations in one dimension, only the formation of a quasi-condensate is possible, which exhibits suppressed density fluctuations, but whose phase fluctuates strongly. It is shown …
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Trace Diagrams, Representations, and Low-Dimensional Topology
This thesis concerns a certain basis for the coordinate ring of the character variety of a surface. Let G be a connected reductive linear algebraic group, and let S be a surface whose fundamental group pi is a free group. Then the coordinate ring C[Hom(pi,G)] of the homomorphisms from pi to G is …
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Luttinger Liquid Behavior in Low-Dimensional Systems
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Rachelle Ramer (rramer2@illinois.edu) on 2012-05-17T17:43:36Z Item is restricted indefinitely.
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Electrical properties of some low-dimensional compounds
Three low-dimensional compounds exhibiting conducting-insulating transitions have been studied. The first of these is the pseudo-one-dimensional compound [C(NH2)3]2Pt(CN)4Bro.23 HLO (GCP) , a material similar to KCP, with the potassium replaced with a large, asymmetric organic cation. Diffuse x-ray …
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Superconducting tunneling spectroscopy of low-dimensional materials
… on the orders of ones or tens of nanometers. Low-dimensional materials are of great interest due to the emergence of quantum effects and increased interactions between electrons, which can be exploited to create novel electronic devices. In this thesis, transport was studied in a variety of …
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Low-dimensional carbon nanotube and graphene devices
… (1991) and graphene (2004) are intrinsically low-dimensional materials with remarkable electronic properties. Combined with semiconductor technologies they might be used to fabricate smaller devices with more complex functionality. This thesis addresses two routes towards this goal. The …
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Theoretical study of interacting low dimensional electron systems
… problem: the Hubbard model on one- and two-dimensional lattices. The technique employed is the small-cluster method wherein the full many-body Hamiltonian for finite clusters with periodic boundary conditions (PBC's) is solved exactly. We first apply this technique to an extended …
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