# Browse by Subject "Physics, Condensed Matter"

• (1994)
Quantized semiconductor structures are presently under investigation for their physical properties and their potential for device applications. The theoretical modeling of these structures is particularly important for ...
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• (1992)
The methods presented in this thesis were developed to study the electron propagation in nanostructures with special emphasis on semiconducting materials. The essence of nanometer-scale physics is in the phase coherence ...
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• (1989)
In this thesis physical effects due to the reduced size of semiconductor devices are investigated theoretically. Effects due to statistical fluctuations and boundary conditions at heterointerfaces are examined, specifically, ...
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• (1993)
The III-V compound semiconductor devices employing quantum well (QW) structures play an essential role in the field of optoelectronics. This thesis focuses on the quantum mechanical aspects of electron dynamics and relaxation ...
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• (1992)
The valence-band structure of a semiconductor quantum well is calculated based on the multiband effective-mass theory. A unitary transformation is found to diagonalize the six-by-six Luttinger-Kohn Hamiltonian into two ...
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• (1995)
We have carried out a theoretical study of surface related phenomena for three bcc transition metals: tungsten (W), molybdenum (Mo) and vanadium (V), using a newly developed atomic potential, the fourth moment method. The ...
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• (1989)
This thesis is a study of escape from metastable wells in one and two dimensional potentials of superconducting devices. We have measured escape rates due to both thermal activation over the barrier and macroscopic quantum ...
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• (1992)
Thermal and accelerated-ion doping, with In and Sb, during Si(001) molecular-beam epitaxy were investigated as a function of growth temperature T$\sb{\rm s}$ (500-1050$\sp\circ$C), dopant energy E$\sb{\rm d}$ (thermal-500 ...
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• (1991)
Activation energies of thermal vacancies have been determined in hcp $\sp4$He as a function of molar volume. A sensitive strain gauge was used to measure the temperature dependence of the pressure in twenty crystals between ...
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• (1990)
Measurements of the electron-phonon relaxation time are carried out, using both a direct and indirect method, in three dimensional films of C$\sb{1-x}$Cu$\sb x$ and Si$\sb{1-x}$Au$\sb x$ in the temperature range 0.3K-4K. ...
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• (1996)
Excitons inside a GaAs quantum well have been the subject of many theoretical and experimental investigations in the past. A number of recent experiments have shown that, at low temperature, excitons combine in pairs to ...
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• (1996)
Neutron scattering and diffraction were used to measure momentum distributions of carbon and fluorine atoms and diffraction patterns of solid C$\sb2$F$\sb6$ from 20 K up to its melting point of 173.3 K, and the momentum ...
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• (1993)
This thesis is divided into two parts. The first describes a study of the dilute Fermi gas with short range repulsive interactions in 2D, with special emphasis on questions related to the validity of Fermi liquid theory. ...
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• (1992)
The crystalline-to-amorphous transition induced by ion implantation was investigated in GaAs and GaP using transmission electron microscopy. The experiments included those performed in situ using the HVEM-Tandem Accelerator ...
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• (1989)
Transport studies examining the dynamics of one-dimensional charge-density wave (CDW) condensates are reported. Results using rf and dc, linear and nonlinear electrical transport techniques have been obtained at temperatures ...
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• (1989)
When quantized fermions are coupled to a background field, nontrivial effects may arise due to the geometry and/or topology of the space of background field configurations. In this thesis, two examples of Berry's geometrical ...
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• (1995)
This thesis reports the investigation of the magnetic behavior of ultrathin epitaxial films of the heavy rare-earth elements; Gd, Er, and Dy, grown with the technique of Molecular Beam Epitaxy (MBE). By employing advanced ...
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• (1990)
A versatile, two-dimensional simulator for various types of semiconductor lasers for both steady and transients has been developed. The simulator is capable of spectral analysis of quantum-well semiconductor lasers, such ...
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• (1990)
Ultrafast flash photolysis is used to investigate the rebinding of carbon monoxide to protoheme (PH), myoglobin at pH = 3 (Mb3), and heme octapeptide (HO) in a glycerol:water (75:25) glass. A new laser system was constructed, ...
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• (1995)
The ultrasonics studies undertaken in this work illustrate the applicability of ultrasonics to a broad variety of problems. In the case of Fe, the objective is to measure the production and annealing of the diaelastic ...
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