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  • Optical constants of polar solids

    Creator:
    Johnson, Jerris Frederick
    Abstract:
    Using the Matsubara Green's function technique we calculate the infrared polariton dispersion relation from the lowest order terms of a Hamiltonian which includes radiation fields and electron effects. The formalism allows generation of higher order interaction terms, one of which contains the Frohlich conduction electron optical phonon interaction. By comparing...
    Resource Type:
    Dissertation
    Full Text:
    approved: Redacted for privacy Allen L. Wasserman Using the Matsubara Green's function technique we

  • Electron-phonon interactions and de Haas-van Alphen effect in dilute non-magnetic alloys

    Creator:
    Bharatiya, Narsingh Ramniwas
    Abstract:
    First the theory of electron-phonon contributions to the de Haas-van Alphen effect in normal systems (pure metals in the nonsuperconducting state ) is reviewed.Then a new derivation of the de Haas-van Alphen oscillations for an interacting system is given.The result is applied to electron-phonon scattering to show that contrary to...
    Resource Type:
    Dissertation
    Full Text:
    Haas-van Alphen Effect in Dilute Non-Magnetic Alloys. Abstract approved: Redacted for Privacy Allen L

  • Coexistance of spin and charge density fluctuations in strongly correlated systems

    Creator:
    Han, Fuxiang
    Abstract:
    Spin and charge density fluctuations are important excitations in the strongly correlated systems, especially in the recently discovered high temperature superconductors. Several different theories on high temperature superconductors have been proposed based on spin fluctuations. However, experiments have also shown the existence of strong charge fluctuations. It is, therefore, desirable...
    Resource Type:
    Dissertation
    Full Text:
    Fluctuations in Strongly Correlated Systems Abstract approved: Allen L. Wasserman Spin and charge density

  • Seebeck coefficient in the high temperature limit

    Creator:
    Easley, Dara L.
    Abstract:
    The Seebeck coefficient is examined in the high temperature limit, using an approach based on a grand partition function containing Hubbard Hamiltonian interaction terms. Although the carriers of interest occupy localized Wannier states, this work is prefaced by the case of delocalized Bloch states, which is examined using Boltzmann transport,...
    Resource Type:
    Masters Thesis
    Full Text:
    Coefficient in the Hi_gb Temperature Limit. Abstract annroverl: Allen L. Wasserman The Seebeck

  • De-Haas van-Alphen effect in the quantum limit

    Creator:
    Karniewicz, Joseph J.
    Abstract:
    In this work we apply the finite temperature formulation of quantum statistical mechanics to an analysis of the de Haas-van Alphen effect in the quantum limit. A new expression is derived for the differential magnetic susceptibility which clearly shows the individual contributions of zero-temperature and non-zero temperature terms. Interactions have...
    Resource Type:
    Dissertation
    Full Text:
    Abstract approved: Allen Wasserman In this work we apply the finite temperature formulation of quantum

  • Collective electronic excitation modes in a superlattice

    Creator:
    Lee, Yong-Inn
    Abstract:
    Collective excitation(plasmon) modes of an electron gas in a multilayer system (superlattice) have been studied in great detail in recent years. One important aspect of this Fermion system is that the dispersion relation of the plasma frequency shows transitional behavior between two- and three- dimensional character. Inelastic light scattering experiment...
    Resource Type:
    Dissertation
    Full Text:
    approved: Redacted for privacy Ay- Allen Wasserman Collective excitation(plasmon) modes of an electron

  • Second harmonic generation in polyacetylene

    Creator:
    Kircher, Jens
    Abstract:
    This study investigates nonlinear optical properties of matter. Nonlinear optical effects have found a wide field of applications such as the extension of the operation range of lasers to higher frequencies, material probes and optical image processing. A brief introduction to the most common nonlinear optical phenomena is given and...
    Resource Type:
    Masters Thesis
    Full Text:
    : ,/ Dr. Allen Wasserman This study investigates nonlinear optical properties of matter. Nonlinear

  • Local field effects on dielectric properties of solids

    Creator:
    Canfield, Lingzhou Li
    Abstract:
    Local field effects on the dielectric properties of solids have been studied for three-dimensional and two-dimensional crystals by using two kinds of dipole models: an atomic dipole model in which dipoles coincide with atom sites and a bond dipole model in which dipoles are placed along bond directions. Local fields...
    Resource Type:
    Dissertation
    Full Text:
    , Professor Allen Wasserman, for his guidance during the course of this work. I would like to express my

  • Heavy fermion effective mass in the superconducting vortex state

    Creator:
    Townsend, Emily A.
    Abstract:
    The extended-Lifshitz-Kosevitch formalism (ELK) unifies the treatment of the de Haas-van Alphen (dHvA) effect, allowing it to transcend its traditional roles of mapping Fermi surfaces and measuring effective masses. Here we exploit the capabilities of dHvA as a probe of many-body effects to examine heavy-fermion su- perconductivity. ELK successfully describes...
    Resource Type:
    Dissertation
    Full Text:
    the Superconducting Vortex State Abstract approved: Allen L. Wasserman The extended-Lifshitz

  • Electron-phonon contribution to the electronic density of states in a dilute alloy

    Creator:
    Hicks, Jay Charles
    Resource Type:
    Dissertation
    Full Text:
    Electronic Density of States in a Dilute Alloy Abstract approved: Redacted for Privacy Allan L. Wasserman