# Browse by Subject "Physics, Condensed Matter"

• (1995)
Acoustic wave propagation is studied via imaging techniques in two regimes not previously amenable to such experiments. (I) The low-temperature phonon-imaging technique is extended to ultrasonic frequencies at room ...

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• (2006-10)
Relaxor ferroelectrics are disordered crystalline materials whose polar order is limited to mesoscopic-scaled nanodomains. There is no ferroelectric phase transition, but a faster than Arrhenius cooperative freezing into ...

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• (1994)
In light of the substantial performance advantages of quantum well lasers relative to double heterostructure lasers, extensive efforts have been directed toward producing quantum wire (QWR) systems. Theory predicts that ...

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• (1989)
In this work, polarized synchrotron radiation is used to obtain both angle resolved photoemission data and angle integrated photoemission data on randomly oriented thick films of metallic silver, thin films of randomly ...

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• (1978)

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• (1990)
The application of electroabsorption in an AlGaAs quantum-well semiconductor laser device for optically based electromagnetic field sensing has been studied. A separate confinement heterostructure laser design containing ...

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• (1992)
Two different kinds of electron energy loss spectroscopies have been used in this thesis to the study of surface chemistry. In the first part of the thesis which includes the first four chapters, Extended Electron Energy ...

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• (1996)
We present, for the first time, an account of single adatom behavior on the close-packed surface of a hexagonally close-packed material. Specifically, we have explored the diffusion and related phenomena of Re and W adatoms ...

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• (1996)
The properties of radiation-induced defects were investigated by examining the radiation-enhanced diffusion and radiation-induced order-disorder kinetics in the ordered intermetallic alloy Cu$\sb3$Au.

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• (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 ...

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• (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 ...

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