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 90 for “"Fermi surface"”.
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Fermi Surface Calculations of Superconducting Compounds
… wir Diboride (MgB$_2$ und TaB$_2$) und schwere Fermionenverbindungen (CeMIn$_5$ und PuMGa$_5$, M=Co, Rh, und Ir) innerhalb der LSD-Näherung.
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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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Search for evidence of fermi surface nesting in Bi₂Sr₂Ca₁Cu₂O₈
… It was suggested by Tsuei (1990) that a nested Fermi surface could be used to explain both the fact that these materials have high superconducting transition temperatures and have linear relaxation rates. It was suggested in that same paper that EELS might be able to confirm the presence of …
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Unconventional Fermi surface in insulating SmB6 and superconducting YBa2Cu3O6+x probed by high magnetic fields
Fermi surface, the locus in momentum space of gapless low-energy excitations, is a concept of fundamental importance in solid state physics. Electronic properties of a material are determined by the long-lived low-energy excitations near the Fermi surface. Conventionally, Fermi surface is …
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Study of the Fermi surface of alkali-metal graphite intercalation compounds using the Shubnikov-de Haas measurements
Thesis: Elec. E., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 1981
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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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STM studies of the nanoscale electronic landscape of the cuprates
… of the material via the configuration of the Fermi surface. I find local variation in both checkerboard order wavelength and in the quasiparticle interference patterns. These variations are consistent with local variations in Fermi surface properties. The discovery of local variations in Fermi …
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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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Spin liquids : mean field and beyond
… in Dirac spin liquid. In Chapter 2, using a fermionic representation for spin-1 system, we find a state where one flavor of spinons has a Fermi surface, while other flavors are gapped out by d + id topological pairing [1]. Despite the existence of a Fermi surface, this ground state has fully …
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High magnetic field study of strongly correlated electron systems
… of a strong magnetic field is a signature of Fermi liquid behaviour and can be used in conjunction with complementary experimental techniques to map the Fermi surface of a metal. For metallic states, the Fermi surface plays a central role in the understanding of correlated electron systems. In …
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Quantum oscillation studies in the unconventional superconductor YFe₂Ge₂ and in the Dirac semimetal candidates NbXSb (X = Ge/Si)
… resistivity (ρ = ρ0 + AT³⁄²) which indicates Fermi liquid breakdown, possibly connected to its vicinity to a quantum critical point. The materials NbXSb (X = Ge/Si) have been theoretically predicted via initial density functional theory (DFT) calculations to harbour Dirac/Weyl-like features in …
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Phases and phase transitions of strongly correlated electron systems
… have different effect on different parts of fermi surface. Perhaps most striking example of this is normal state of optimally doped cuprates; the quasiparticle peaks on the nominal fermi surface do not appear uniformly. We try to track such phenomena in heavy fermion systems, which are …
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Single particle spectrum of the two dimensional electron gas
… a range from 15 meV above to 15 meV below the Fermi surface. We provide the first direct measurements of the width of the single-particle exchange gap and single particle lifetimes in the quantum Hall system. At higher energies, we observe the splitting of highly excited Landau levels by spin …
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Quantum simulations on square and triangular Hubbard models
… correlated region and the structure of the Fermi surface in this region will favor superconducting pairings with a certain type of symmetry. For the cuprate physics, a superconducting dome composed of d-wave pairings has been identified experimentally. We study the Hubbard model on square …
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Phase-Coherent Drag of Plasmons in a 2D Flowing Fermi Liquid
… a moving medium. Time reversal breaking due to Fermi surface polarization by the flow results in nonreciprocity: collective modes acquire a ±𝑘 asymmetry in mode dispersion. This thesis explores plasmonic drag in two-dimensional electron fluids with a full account given to the Fermi-liquid …
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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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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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Anistropic phenomena in strongly correlated electron systems
… is determined; phases are discovered where the Fermi surface consists of small hole pockets, and the Mott transition happens as these pockets shrink to points. Anisotropic phenomena observed in the cuprates are reproduced by the theory; a pseudogap destroys the Fermi surface in some places, …
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Electronic structure and transport in molecular and nanoscale electronics
… by various examples, including band structure, Fermi surface, Mülliken charge, bond order, and quasiatomic-orbitals-projected band structure and quasiatomic-orbitals-projected Fermi surface. Remarkably these quasiatomic orbitals reveal the symmetry and chemical bonding nature of different …
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