# Browse by Subject "Physics, Condensed Matter"

• (1995)
In this work, a water vapor oxidation process is used to convert high Al composition $\rm Al\sb{x}Ga\sb{1-x}As$ to a stable native oxide. The native oxides described are formed at temperatures in the range of 400$\rm\sp\circ ... PDF (3MB) • (1996) This thesis describes NMR measurements involving carbon-13, deuterons, and protons in acetylene ($\rm C\sb2H\sb2$) adsorbed at room temperature on supported platinum catalysts. PDF (4MB) • (1991) The author reports the study of diffusion of carbon monoxide on supported palladium and platinum clusters by Nuclear Magnetic Resonance. As part of these studies, a novel NMR technique for studying diffusion (called an ... PDF (3MB) • (1996) Currently, there is a great deal of interest in metallic multilayer systems, in particular magnetic multilayer structures, for both technological and scientific reasons. Since the growth properties and band structures for ... PDF (5MB) • (1989) This thesis describes work done in two separate areas of the field of superconductivity. The first part describes experiments performed to measure a predicted, but previously unmeasured non-equilibrium effect in superconducting ... PDF (3MB) • (1995) In this thesis we study certain nonequilibrium properties of mesoscopic superconducting rings, i.e., rings of finite circumference. Two classes of nonequilibrium behavior will be considered: (i) the system is prepared in ... PDF (5MB) • (1992) Structural and magnetic properties of heavy rare earth films and superlattices synthesized by molecular beam epitaxy are investigated. Epitaxial films of rare earth metals, and superlattices of rare earths with Y interlayers, ... PDF (8MB) • (1994) This thesis contributes to the application of nuclear magnetic resonance (NMR) techniques in studying structural phase transitions (SPT's) of the SiO$\sb2$cristobalite and SiO$\sb2$and AlPO$\sb4$tridymite polymorphs. ... PDF (5MB) • (1990) We have used NMR to study the structure and reactions of acetylene and ethylene adsorbed on small catalyst particles. By monitoring$\sp{13}$C-$\sp{13}$C and$\sp{13}$C-$\sp1$H dipolar couplings we found the carbon-carbon ... PDF (6MB) • (1995) In this thesis we report$\sp1$H and$\sp{13}$C NMR measurements in the normal and superconducting states of the organic superconductor$\kappa$-(ET)$\sb2$Cu (N(CN)$\sb2$) Br (T$\sb{\rm c}$= 11.6 K). These measurements ... PDF (7MB) • (1992) In this thesis we report measurements of the$\sp{63}$Cu Knight shift in the superconducting state for the plane (Cu(2)) and chain (Cu(1)) sites in YBa$\sb2$Cu$\sb3$O$\sb7$. We also have measured the temperature and field ... PDF (8MB) • (1991) We have used NMR to study the properties of promoted catalysts prepared by adding alkali metals (Na, K, Rb, or Cs) to silica supported Pt clusters. We have also examined the effect of the alkali metals on CO and ... PDF (4MB) • (1989) The author has observed, and studied quantum size effects in the NMR of small, supported platinum particles with a monolayer of carbon monoxide chemically adsorbed to the surface. The effects are observed in the$\sp{13}$C ... PDF (3MB) • (1992) Numerical modeling of nonstationary transport effects using partial differential equations derived from the Boltzmann Transport Equation (BTE) is investigated. Augmented drift-diffusion (ADD) models and improved energy ... PDF (3MB) • (1989) In this thesis we study three problems in phase transitions and critical phenomena. PDF (4MB) • (1994) The universal behavior of insulating glasses at low temperature, compatible with but not explained by the tunnelling two level (TLS) model is reviewed. Recent non-equilibrium dielectric experiments on the capacitance of ... PDF (3MB) • (1991) Data are presented on Al$\sb{\rm y}$Ga$\sb{\rm 1-y}$As-GaAs-In$\sb{\rm x}$Ga$\sb{\rm 1-x}$As quantum well heterostructure diode lasers showing that the large band filling range of a combined GaAs-In$\sb{\rm x}$Ga$\sb{\rm ...
PDF (4MB)
• (1994)
In this thesis the electronic and optical properties of confined and unconfined excitons in semiconductor quantum heterostructures are investigated. We use multiband effective mass theory to solve the subband structure in ...
PDF (3MB)
• (1990)
In this thesis we investigate the optical properties of modulation doped GaAs/AlGaAs and strained-layer undoped InGaAs/GaAs multiple quantum well structures (MQWS). The phenomena studied are the effects of carrier, strain, ...
PDF (4MB)
• (1992)
This thesis presents theoretical investigations of the subband structure and optical properties of semiconductor quantum wires. For the subband structure, we employ multiband effective-mass theory and the effective ...
PDF (5MB)