Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Fermi surfaces"”.
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Effect of high pressure on the Fermi surfaces of zinc and aluminum
… of pressures up to 7 kbar on portions of the Fermi surfaces of zinc and aluminum has been determined by using the field-modulation technique to detect de Haasvan Alphen oscillations and by using solid helium as a pressure medium. The primary result obtained in the study of zinc was that the …
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High magnetic field quantum oscillation study of Fermi surfaces in bulk unconventional insulators
… begun to blur. The recent discovery of a bulk Fermi surface in the Kondo insulator SmB6 has raised serious questions about how a fundamentally metallic property could be intrinsically realized in a robust insulator. This thesis describes my work to further our understanding of this surprising …
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The Death of Quasiparticles: Strongly Interacting Gapless Phases with Fermi Surfaces and Fractional Statistics
… interactions and two additional ingredients – Fermi surfaces and fractional statistics. Chapter 2 through Chapter 5 focus on strongly interacting metals with Fermi surfaces. The most salient examples are a class of Hertz-Millis models describing the onset of spontaneous symmetry breaking in a …
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Study of the fermi surfaces of graphite intercalation compounds using Shubnikov de Haas effect
Thesis: M.S., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 1980
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Fermi Surfaces and Where to Find Them: Quantum Oscillations in Kondo Insulators and High-Temperature Superconductors
The Fermi surface is a geometric concept that codifies the momenta of all electrons at the Fermi level. It is these electrons that underpin most physical properties of metals, and have made quantum oscillations, the experimental manifestation of the Fermi surface, a hallmark signature of metals. In …
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Fermions at finite density in the nonrelativistic gauge/gravity duality
… This thesis presents the computation of retarded fermion Green functions at finite density and zero temperature in the nonrelativistic gauge/gravity duality. We find evidence of Fermi surfaces and investigate their properties. We show that the near-horizon scaling dimension, an important quantity …
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Patterns of electro-magnetic response in topological semi-metals
… we consider semimetals which have point like Fermi surfaces in various spatial dimensions $D=1,2,3$ which naturally occur in the transition between $n$th order weak topological insulators and a trivial insulating phase. These semimetals include those of Dirac and Weyl type. We construct these …
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Communal pairing in Fermi gases with attractive interactions
Weak attractive interactions in a spin-balanced fermion gas are known to induce a Cooper pairing instability where the fermion pairs have zero net momentum, leading to BCS superconductivity. Extensions for spin-imbalanced systems include breached superfluids, Fulde–Ferrell–Larkin–Ovchinnikov …
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Topological semimetals and nodal superconductors
… derive a classification of topologically stable Fermi surfaces in semimetals and nodal lines in superconductors.
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Electromagnetic response of time-reversal breaking metallic phases in two dimensions
… which corresponds to the Berry curvature on the Fermi surface. The alpha phase does not have that property. To go beyond the mean-field, we introduce the machinery of higher dimensional bosonization. Our preliminary results show that in the mean field limit of the bosonized theory, the fluid …
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Vignettes in string theory : using geometry to probe the worldsheet and strongly coupled physics
… Reissner-Nordstrom black holes in AdS 4 and fermion correlation functions describing Non Fermi Liquids. We numerically study the effects of adding magnetic and electric dipole couplings for the fermions in the bulk. In general, the low energy physics is controlled by an emergent AdS 2 …
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Interacting non-Abelian anyons in an exactly solvable lattice model
… phases appearing in the model, we consider Fermi surface, whose topology captures the long-range properties. Each phase is found to be characterized by a distinct number of Fermi points, with the number depending on distinct global Hamiltonian symmetries. To study how the Fermi surfaces …
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Geometry and topological phase of matter
… Landau Level system where the two composite Fermi surface acquires interlayer coherence and forms bonding/anti-bonding composite fermi sea. The corresponding interlayer coherent composite Fermi liquid(ICCFL) phase provides a straightforward landscape to verify the Dirac nature in Son's theory …
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High Pressure Quantum Oscillation Study of BiTeI and Bi2Te3
… oscillation measurements, the evolution of the Fermi surface of both materials was tracked as a function of pressure. At ambient pressure, two distinct quantum oscillation frequencies in BiTeI, corresponding to inner and outer Fermi surface orbits as a result of spin-splitting caused by the …
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The effects of uniaxial compression on the third zone Fermi surface of aluminum
Submitted by Megan O'Donnell (mnodonn2@illinois.edu) on 2012-03-14T19:42:35Z No. of bitstreams: 1 1971_spurgeon.pdf: 2717657 bytes, checksum: dc3330ba61b24861c637c7c8e34e91ee (MD5)
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Topics in the Theory of Quantum Degenerate Gases
… orbital motion. They induce a splitting of the Fermi surfaces of up and down spins. We start by considering a one dimensional system and explicitly write down the wavefunction that pairs states with unequal energies due to the splitting. Next we consider an extension to three dimensions and work …
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Topics in the theory of quantum degenerate gases
… orbital motion. They induce a splitting of the Fermi surfaces of up and down spins. We start by considering a one dimensional system and explicitly write down the wavefunction that pairs states with unequal energies due to the splitting. Next we consider an extension to three dimensions and work …
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Spectral properties of strongly correlated electron systems
… the ARPES results on the band structure and the Fermi surface of Nd{2-x}Ce_xCuOCl_{4-\delta} are naturally obtained within the t-t-U Hubbard model without further need for readjustment or fitting of parameters, as proposed in recent theoretical considerations. We present a theory for the photon …
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The Influence of Contact Transparency on the Superconducting Proximity Effect in Thin Semiconducting Films
… quantum channels between the two different Fermi surfaces and using the Landauer formalism to determine the ideal junction conductance. Comparison to the experimental junction conductance permits the discovery of the fundamental transmission coefficient for transport across the N-S …
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Holography and strongly correlated systems
… We review earlier work indicating that fermionic perturbations of such a state reveal non-Fermi-liquid behavior, i.e. gapless fermionic excitations that are not those of Fermi liquid theory. We perform a one-loop calculation in the bulk to compute the contribution from these Fermi …
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