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 26 for “"Quantum wire"”.
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Indium-Gallium-Arsenide Quantum Wire Infrared Photodetectors
… and 8.4 mum) InxGa 1-xAs/In0.52Al0.24Ga 0.24As quantum wire infrared photodetectors (QRIPs) grown on semi-insulating (001) on-axis InP substrates via solid-source molecular beam epitaxy (MBE) have been fabricated and characterized. The quantum wires (QWRs) were formed using an in situ on-step …
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Fabrication of nonlithographic semiconductor quantum wire infrared photodetector
The thesis describes novel semiconductor quantum wire infrared photodetectors in the long- and very long-wavelength regions. The infrared photodetectors are based on intersubband transitions in semiconductor quantum wires and have the potential for higher operational temperature, increased …
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Long-wavelength gallium-indium-arsenide quantum wire lasers
… multiple quantum wire (MQWR) lasers grown on (100) on-axis InP substrates by a single-step MBE have been successfully fabricated and characterized. The QWRs were formed in situ in the (GaAs)$\sb2$/(InAs)$\sb{2.2}$ short-period-superlattice (SPS) layers by …
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Development and Characterization of Intermediate-Band Quantum Wire Solar Cells
<p>The effects of a quantum wire intermediate band, grown by molecular beam epitaxy, on the optical and electrical properties of solar cells are reported. To investigate the behavior of the intermediate band, the quantum wires were remotely doped at three different doping concentrations, the number …
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Aluminum gallium indium phosphide quantum wire heterostructures and photonic device applications
Restriction data tranferred 2014-07-01T11:30:46-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission
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Fabrication of Gallium Indium Arsenide Phosphide Quantum Wire Heterostructures for Optoelectronic Applications
Thermal annealing techniques were also applied to QWRs. After this treatment, emissions were found to be at a higher energy than the as-grown samples, attributed to the disordering of the lateral composition modulation which, in effect, raised the bandgap energy of the QWR material. In addition, …
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Fabrication of quantum wire heterostructures and short wavelength photonic devices using the strain-induced lateral-layer ordering process
… semiconductor laser performance. The use of quantum size effects has been studied for over 25 years. It has been predicted and shown that the incorporation of one-dimensionally confined quantum wells into laser devices can significantly improve their performance. The next logical step is to …
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Benchmarking measurement-based quantum computation on graph states
Measurement-based quantum computation is a form of quantum computing that operates on a prepared entangled graph state, typically a cluster state. In this dissertation, we will detail the creation of graph states across various physical platforms using different entangling gates. We will then …
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Strained-Layer Indium Gallium Arsenide-Gallium Arsenide-Aluminum Galium Arsenide Photonic Devices by Metalorganic Chemical Vapor Deposition
… of the substantial performance advantages of quantum well lasers relative to double heterostructure lasers, extensive efforts have been directed toward producing quantum wire systems. In view of this, the final subject of this dissertation details the fabrication and characterization of …
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Optical properties of semiconductor quantum wires
… and optical properties of semiconductor quantum wires. For the subband structure, we employ multiband effective-mass theory and the effective bond-orbital model both of which fully account for the band mixing and material anisotropy. We also treat the structure geometry in detail taking …
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Optical properties of semiconductor quantum wires
… and optical properties of semiconductor quantum wires. For the subband structure, we employ multiband effective-mass theory and the effective bond-orbital model both of which fully account for the band mixing and material anisotropy. We also treat the structure geometry in detail taking …
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Magnetotransport along non parabolically confined quasi-one-dimensional channels
The one-electron spectrum, pertinent to a quantum wire in the presence of a magnetic field, is obtained for parabolic and weakly nonparabolic confining potentials. Different orientations of the magnetic field are considered and the corresponding ac and do responses of the wire are evaluated, for …
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Computational approaches to silicon based nanostructures
… of semiconductor device structures where quantum effects are important, as for example quantum wires and quantum dots but also ultra-narrow Metal-Oxide-Semiconductor (MOS) conduction channels at room temperature. Here, we describe these structures by the coupled system of the Schrodinger …
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The effect of quantum confinement on the thermoelectric figure of merit
… transport principle in the Si/Si1-xGex quantum well superlattice (two-dimensional) system and in the Bi quantum wire (one-dimensional) system. In bulk form, Si1_xGex is a promising thermoelectric material for high temperature applications. The Si/Si1 _xGex quantum well superlattice …
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Increasing the bit density of a quantum confinement physically unclonable function
… institute. We study the recently proposed quantum confinement physically unclonable function by Roberts, et al. that utilises resonant tunnelling diodes (physical representation of a quantum well) and atomic scale imperfections for applications in cryptography and identification. Presently …
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Optical studies of III-V quantum wires grown by strain induced lateral ordering (SILO) process
… have been utilized to carefully study the quantum wires grown via strain induced lateral ordering (SILO) which is a bulk thermodynamics driven self-ordering process. Fourier transform photoluminescence (FTPL) measurements have been employed to study the polarization anisotropy in the …
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Spin Polarized Transport in Nanoscale Devices
… process of spin relaxation in a semiconductor quantum wire. This process of spin relaxation occurs because during transport electron spin precesses like a spinning top about the spin-orbit magnetic field. We show that the conventional drift-diffusion model of spin transport, which has been used …
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Flow of Entropy in Equilibrium and Non-Equilibrium Quantum Systems
… coming technological revolution, those of open quantum systems in and out of equilibrium. Simple and comprehensible formulas for global and local heat and entropy currents are proposed and interpreted through the use of Non-Equilibrium Green's Function theory (NEGF). Thorough exploration and …
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Tunable spin polarization and conductance anomalies in mesoscopic one-dimensional systems
… – for instance, the “0.7” conductance anomaly in quantum point contacts – have remained unexplained. In this dissertation, we present a comprehensive theoretical model for electronic transport in quasi-1D systems, accounting for many-body effects and neglecting spin–orbit couplings. Then, with …
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