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 12 of 12 for “"Conduction and valence bands"”.
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Effect of Nanoscale Defects on Electrical and Optical Properties in Iii-V Semiconductors
… finite element method to study effects of edge and screw dislocations on optical properties in GaN. Energy levels and corresponding wave functions are obtained for the conduction and valence bands, and spontaneous emission spectra are evaluated to compare with available experimental results. …
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Scanning tunneling microscopy and spectroscopy of topological materials with broken symmetry
… the probing of physics governing the electronic and structural properties of topological materials. In three-dimensional topological insulators, the native substitutional defects result in a shift of the chemical potential into the conduction and valence bands. The added conduction channels …
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Study of Type-I and Type-Ii Strained Quantum -Well Lasers
… quantum wells (QWs) (type-I, staggered type-II, and broken-gap type-II QWs) are studied. For a type-I QW structure, the 1.55-pm InGaAsP and InGaAlAs QW lasers are investigated both in the steady-state and high-speed modulation schemes. We show excellent agreement of our experimental data with the …
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Luminescence studies of the excitonic system in germanium: Phase properties and transport
… These studies employ near-infrared spectroscopy and imaging techniques to examine the phase and transport properties of the low temperature exciton-plasma system. The first study, presented in Chapter II, examines the properties of the electron-hole liquid (EHL) phase as a function of …
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High-pressure states of bismuth
… almost completely gaps the electronic energy bands, producing a rhombohedral metal with a tiny overlap of conduction and valence bands. The resulting solitary free electron per 100,000 atoms can travel large distances in high-purity crystals, leading to a host of unusual properties. We show …
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Theory of topological insulators and its applications
… new materials to sustain the continuous progress and improvements in the current electronic devices. Traditionally, three material types are in use: 1) Metals 2) Semiconductors 3) Insulators. All the three material types are classified according to the energy gap between conduction and valence …
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Investigation of magnetic interactions in topological insulators
… of phases in condensed matter with inverted conduction and valence bands, which is protected by time reversal symmetry. As a result, the bulk keeps insulating while the surface supports an exotic high-mobility spin-polarized electronic states. Introducing magnetism into topological insulators …
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Electronic and optical properties of InAs nanocrystals
… method is used to investigate the electronic and opti- cal properties of spherical InAs nanocrystals. Our calculated interband (valence-to- conduction) absorption spectra reproduce the features observed experimentally both qualitatively and quantitatively. The results relative to intraband …
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Growth and characterization of epitaxial silver indium diselenide
… a key player in the renewable energy frontier, and will become increasingly important as their cost per watt continues to drop, especially if fossil fuel costs increase. One particularly promising photovoltaic technology is based on chalcopyrite-structure semiconductors. Within the chalcopyrite …
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Bioelectrochemical production of graphene oxide using bacteria as biocatalysts
The demand for production of graphene oxide (GO), which is a precursor for large-scale production of graphene, has been increasing due to the broad array of uses of both nanomaterials. Due to the unique electrical and mechanical properties of these 2D nanomaterials, applications in composites have …
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Enhancement of the UV emission in metal nanoparticle-coated ZnO
… surface plasmons (LSP) into hot carriers and their radiative recombination following injection into the ZnO conduction and valence bands. The other describes the creation of an additional fast relaxation pathway via a dipole-dipole coupling mechanism between excitons in ZnO and the metal …
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Role of sulfur in vibration spectra and bonding and electronic structure of GeSi surfaces and interfaces
… atomic configuration, vibration mode frequencies and electronic structure of surfaces and interfaces using germanium. Initially, we investigated the H2S and H2Opassivated germanium surfaces. A supercell approach is used with the local density (LDA), generalized gradient (GGA) approximations and …