# Browse by Subject "Physics, Condensed Matter"

• (1995)
High resolution transmission electron microscopy (HRTEM) has been extensively used as a structure characterization technique in materials and biological science. In the past, qualitative use of HRTEM has been primarily employed.

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• (1996)
The goals of our research have been to: (i) expand the applicability of the quantum Monte Carlo (QMC) methods to larger molecular systems and check the reliability of traditional approaches, (ii) determine the impact of ...

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• (1994)
Quantum Monte Carlo techniques; in their various incarnations, calculate ground state or finite temperature properties of many-body quantum systems. We apply the path-integral Monte Carlo method to hydrogen at densities ...

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• (1995)
Quantum Monte Carlo has been established as a powerful computational tool to study quantum many-body systems. It has been successfully applied to small atoms and molecules, the electron gas, hydrogen at high pressures, ...

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• (1994)
Variational and Diffusion Monte Carlo are powerful computational methods which can afford accurate estimates of the ground state properties of quantum many-body problems. We have applied these Monte Carlo methods to the ...

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• (1994)
Quantum Monte Carlo has recently made great progress as a computational tool for quantum many-body systems. We have extended previous Monte Carlo methods to study both ground state and excited states of the two-dimensional ...

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• (1996)
Recent experiments on high-density excitons in Cu$\sb2$O provide evidence for degenerate quantum statistics and Bose-Einstein condensation of this nearly ideal gas. We model the time dependence of this bosonic system ...

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• (1985)
The charge-density wave (CDW) dynamics of the linear chain compound orthorhombic TaS(,3) is characterized by extensive measurements of dc conductivity, ac admittance, direct mixing, harmonic mixing, second harmonic generation, ...

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• (1995)
In this work we consider systems in which small normal-metal structures (N) are put into contact with a large superconductor (S), with the goal of spatially characterizing the superconductivity. Confined regions with ...

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• (1991)
The central work of this thesis is many-body Green's Function Method calculations in atoms using Hedin's GW approximation with various vertex corrections, leading to polarizabilities and quasiparticle energies, which are ...

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• (1994)
Luminescent porous silicon is formed by anodization of silicon in HF acid in the dark and then under UV illumination. When illuminated with UV, samples exhibit a bright orange photoluminescence with a quantum efficiency ...

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• (1995)
The ordered intermetallic Ni$\sb3$Al was used in two series of experiments that were designed to elucidate both fundamental and practical aspects of radiation damage. The first is a Transmission Electron Microscopy ...

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• (1994)
Alcohol, methylamine, acetylene, and ethyl iodide decomposition on platinum single crystal surfaces have been investigated in this thesis work. The objective of this research is to examine factors affecting surface reaction ...

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• (1990)
Si(100) films were doped with 100, 200, 500, and 1000 eV $\sp{11}$B$\sp+$ and $\sp{75}$As$\sp+$ ions during growth by molecular-beam epitaxy (MBE) at temperatures of 800, 650, and 500 $\sp\circ$C. Photoluminescence (PL) ...

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• (1996)
We have studied resistance noise in a variety of systems exhibiting giant magnetoresistance (GMR) including coupled and uncoupled multilayers, spin-valves and granular systems. Large equilibrium 1/f noise in the resistance ...

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• (1991)
We have measured the normal state resistivity of well characterized polycrystalline, twinned-single crystal, and twin-free single crystal samples of superconducting YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-y}$. The resistivity was ...

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• (1992)
Described in this thesis is an investigation of novel structures consisting of optoelectronic devices integrated into Fabry-Perot resonant cavities. The photosensitivity of conventional detectors is governed by the optical ...

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• (1991)
Raman spectroscopy, an inelastic light scattering technique, explores III-V semiconductors by conveying crystal lattice structural information and by probing carrier dynamics both directly and via the electron-phonon ...

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• (1996)
In this thesis, I present the results of a theoretical investigation of ordering processes induced by symmetry-breaking quenches in two physical systems. Both systems investigated possess a rich homotopy structure of the ...

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• (1991)
Scanning tunneling microscopy (STM), photoemission spectroscopy, and a variety of other experimental techniques have been used to examine both the initial stages of interface formation between various adsorbates, as well ...

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