# Browse by Subject "Physics, Condensed Matter"

• (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 ...

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• (1993)
In this thesis, the significance and the range of applicability of the classical concepts of capacitance and resistance to semiconductor nanostructures are investigated. In particular, the combination law for the conductances ...

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• (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$\sb{\rm ... application/pdf PDF (4Mb) • (1981) The performance in a cw optically pumped far infrared (fir) laser of a hybrid metal mesh-dielectric mirror consisting of an assembly of thin metallic and semiconducting films is evaluated. Its construction is described and ... application/pdf PDF (4Mb) • (1994) In this thesis the electronic and optical properties of confined and unconfined excitons in semiconductor quantum heterostructures are investigated. We use multiband effective mass theory to solve the subband structure in ... application/pdf PDF (3Mb) • (1990) In this thesis we investigate the optical properties of modulation doped GaAs/AlGaAs and strained-layer undoped InGaAs/GaAs multiple quantum well structures (MQWS). The phenomena studied are the effects of carrier, strain, ... application/pdf PDF (4Mb) • (1966) application/pdf PDF (4Mb) • (1992) This thesis presents theoretical investigations of the subband structure and optical properties of semiconductor quantum wires. For the subband structure, we employ multiband effective-mass theory and the effective ... application/pdf PDF (5Mb) • (1968) application/pdf PDF (2Mb) • (1992) Optical emission spectra from the np$\sp5$initial core-excited configurations of the alkaline-earth metals calcium, strontium, and barium are presented. The spectra are found to be anomalously broad and red-shifted with ... application/pdf PDF (5Mb) • (1993) A series of oxide superconductors and related compounds, including: BaPbO$\sb3,$BaBiO$\sb3,$BaSb$\sb{0.25}$Pb$\sb{0.75}$O$\sb3,$BaBi$\sb{0.25}$Pb$\sb{0.75}$O$\sb3,$Ba$\sb{0.6}$K$\sb{0.4}$BiO$\sb3,$Bi$\sb2$Sr$\sb2$CuO$\sb{\rm ...

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• (1990)
In this study, solid state nuclear magnetic resonance (NMR) spectroscopy is used to investigate the structural, electronic, and dynamical properties of a variety of high temperature oxide superconductors and metal carbonyls ...

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• (1989)
This study presents $\sp{17}$O NMR spectra of randomly and magnetically oriented samples of various high-$T\sb{c}$ superconductors. Systems under investigation include: (BaK)BiO$\sb3$, La$\sb{1.85}$Sr$\sb{0.15}$CuO$\sb4$, ...

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• (1994)
Based on Richard P. Feynman's formulation of quantum mechanics, Path Integral Monte Carlo is a computational ab-initio method to calculate finite temperature equilibrium properties of quantum many-body systems. As input, ...

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• (1990)
We study two representative problems related to the dynamics of pattern formation in non-linear, dissipative systems far from equilibrium. The first problem addresses the dynamical mechanism of velocity and shape selection ...

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• (1990)
The quaternary material aluminum gallium indium prosphide (($\rm Al\sb{x}Ga\sb{1-x})\sb{y}In\sb{1-y}P$) is used in the fabrication of visible lasers and light emitting diodes. There are problems in this material related ...

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• (1990)
Data are presented demonstrating that the control of the edge-to-edge resonator Q across a cleaved rectangular sample is essential in identifying unambiguously photopumped phonon-assisted laser operation of Al\$\sb{\rm ...

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• (1989)
The III-V compound semiconductor materials are used in a wide variety of electronic, optoelectronic and microwave device applications. Temperature dependent photo-Hall effect measurements have been made on the high purity ...

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• (1995)
The techniques of phonon imaging are used in conjunction with photoluminescence measurements to determine the characteristics of optically generated phonon sources in Si, Ge and GaAs at 1.7K. Focused-laser excitation of a ...

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• (1996)
Several experimental surface science techniques, such as photoelectron diffraction (PED), photoemission extended fine structure (PEFS), and photoelectron holography (PEH), rely upon the measurement of the interference due ...

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