# Browse by Subject "Physics, Condensed Matter"

• (1989)
This thesis deals with the theory of the primary nucleation and subsequent expansion of the superfluid $\sp3$He-B phase in the metastable, hypercooled A phase. An overview of the theory of dynamical phenomena in Fermi ...

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• (1996)
The growth rates of Si(001) and Ge(001) by gas-source molecular-beam epitaxy (GS-MBE) from $\rm Si\sb2H\sb6$ and $\rm Ge\sb2H\sb6$ as a function of T$\sb{\rm s}$ are well described by a model based upon dissociative $\rm ... application/pdf PDF (6Mb) • (1995) The properties of a silicon adatom on Si(001) surface and around three single-layer steps, namely type A (S$\rm\sb A$), bonded type B (S$\rm\sb B$) and nonbonded type B (S$\rm\sb{B\sp\prime}$), on Si(001) have been studied, ... application/pdf PDF (5Mb) • (1990) Free excitons provide the only experimental system other than helium in which the behavior of particles with mass is known to follow Bose-Einstein statistics. I present experimental observations of the kinetic energy ... application/pdf PDF (8Mb) • (1994) Excitons in Cu$\sb2$O have been demonstrated to be a nearly ideal gas of bosons, providing a unique system for studying Bose-Einstein statistics and Bose-Einstein Condensation of an ideal gas in the laboratory. In this ... application/pdf PDF (7Mb) • (1994) In this thesis the method of bosonization of fermionic many-body systems in any number of dimensions is developed. After an introduction to the problem in chapter 1 and to the method of bosonization in chapter 2 (with its ... application/pdf PDF (5Mb) • (1995) In this thesis we derive a set of bosonization rules for the problem of a fermionic interacting system living on the half line coupled to a quantum degree of freedom at a boundary. This is an appropriate model to describe ... application/pdf PDF (4Mb) • (1992) Brillouin light scattering studies have been made on the temperature dependence and dispersion of long-wavelength acoustic phonons in single-crystal Dy films and long-wavelength acoustic magnons in single-crystal Gd films. ... application/pdf PDF (6Mb) • (1993) The development of carbon doping for producing stable p-type doping profiles in MOCVD-grown GaAs has made MOCVD the preferred technique for production of highly reliable GaAs-based HBT structures. In the InP/InGaAs materials ... application/pdf PDF (5Mb) • (1990) A dilute mixture of CCl$\sb4$in high purity H$\sb2$has been used as a carbon dopant source for$\rm Al\sb{x}Ga\sb{1-x}As$grown by low pressure metalorganic chemical vapor deposition (MOCVD). To understand the mechanism ... application/pdf PDF (2Mb) • (1993) Density matrix formulation is used to investigate the nonlinear optical properties of semiconductor quantum-well devices. The generation of terahertz electromagnetic pulses from ultrafast optical pulse excitations of ... application/pdf PDF (3Mb) • (1989) The diffusion of zinc in GaAs is highly anomalous in that the diffusion coefficient (D) is proportional to the zinc concentration squared in marked contrast to Fick's law which predicts that D is concentration independent. ... application/pdf PDF (5Mb) • (1991) The routing capabilities of waveguides defined by Zn, SiO$\sb2$, and In/SiO$\sb2$Impurity-Induced Layer Disordering (IILD) of a single GaAs quantum-well graded barrier laser structure are investigated using raised-cosine ... application/pdf PDF (3Mb) • (1987) A detailed experimental study of the remarkable collective-transport properties of charge-density-wave (CDW) conductors is presented. Measurements of current oscillations observed in response to applied dc voltages and of ... application/pdf PDF (8Mb) • (1990) A new and unique high vacuum crystal growth system has been developed. The gas source molecular beam/chemical beam epitaxial growth system features a 7000 l/s diffusion pumping system mounted directly beneath a molecular ... application/pdf PDF (4Mb) • (1992) This thesis is primarily concerned with a quantitative investigation of the chemical diffusion of oxygen in YBa$\sb2$Cu$\sb3$O$\sb{\rm 6+x}$. The research also investigates the optimization of crystal growth and the ... application/pdf PDF (9Mb) • (1993) A comparison between (InAs)$\sb1$/(GaAs)$\sb1$short-period-superlattice (SPS) and$\rm In\sb{0.5}Ga\sb{0.5}As$alloy quantum-well structures grown on GaAs substrates has been made. Structural properties, photoluminescence ... application/pdf PDF (2Mb) • (1990) The conduction noise from sliding charge-density waves (CDWs) is studied in NbSe$\sb3$and K$\sb{0.3}$MoO$\sb3$(blue bronze). A statistical analysis of the fluctuations in the noise is presented: the probability distributions ... application/pdf PDF (4Mb) • (1992) In this thesis we address three problems associated with the mass flow and orbital hydrodynamics of$\sp3$He-A. The first concerns the form of the T = 0 mass current in local equilibrium; the second is a paradox associated ... application/pdf PDF (4Mb) • (1994) The recent experimental results on granular superconducting films have suggested an universal sheet resistance threshold of 6.4 k$\Omega\$/square, below which all films become superconducting with decreasing temperature, ...

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