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 29 for “"liquid theory"”.
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Topics in low temperature Fermi liquid theory
Several topics in quantum liquids are discussed including the elementary excitation spectrum of 3 He under pressure, spin polarized 3 He, and an early attempt to formulate a Fermi liquid theory to describe the low temperature thermodynamic and transport properties of the heavy electron system UPt3. …
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The existence of singular terms and their effects on the validity of Fermi liquid theory in two dimensions
The question of the breakdown of Fermi liquid theory in two dimensions is examined in the context of perturbation theory for a dilute interacting Fermi gas. The quasiparticle interaction function, fic;u;, is calculated for such a system. The interaction function, calculated to second order in terms …
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Interacting fermions : a holographic approach/
… are usually described by Landau's Fermi liquid theory. That is, they behave more or less like a free Fermi gas, with a few modifications due to electron-electron interactions. However, there exist a few metallic materials whose phenomenology does not fit within Fermi liquid theory. These …
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Slave particle study of the strongly correlated electrons
… developed by Russian physicist Lev Landau: his theory of phase transition, and Fermi liquids. The Landau theory of phase transition and the Fermi liquid theory together, can successfully explain a wide range of phenomena from ferromagnetism and antiferromagnetism to the conventional …
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Topics in many-body physics
… on questions related to the validity of Fermi liquid theory. We find that despite the existence of non-perturbative effects due to two-dimensionality, namely linearly dispersing excitations of ""bound"" holes, the system remains in a Fermi liquid state. The quasi-particles are both long lived …
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Single Electron Tunneling at Large Conductance
… Electrons in the leads are described by Fermi liquid theory and considered as free quasiparticles where the charge is screened and Coulomb energy is included implicitly in the dispersion relation. During the tunnel process, however, the Coulomb energy is treated exactly leading to Coulomb …
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Radio-frequency spectroscopy of ultracold atomic Fermi gases
… which can be described by Landau's Fermi liquid theory. A critical interaction strength can be identified separating the regime of a fermionic polaron and a bosonic polaron. Radio-frequency spectroscopy of the polarized superfluid phase allows an accurate measure of the superfluid gap …
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Zigzag Phase Transition in Quantum Wires and Localization in the Inhomogeneous One-Dimensional Electron Gas
… 1D electron gas is described by Luttinger Liquid theory. We use Quantum Monte Carlo methods to study two situations that are beyond Luttinger Liquid theory --- the quantum phase transition from a linear 1D electron system to a quasi-1D zigzag arrangement, and electron localization in …
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Aspects of quantum criticality in itinerant electron ferromagnetic systems
Fermi-liquid theory is one of the standard models of condensed matter physics, supplying a valid explanation of the low temperature properties of many metals. However, non-Fermi-liquid behaviours arise in many itinerant systems that exhibit a zero temperature magnetic phase transition. This thesis …
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Quantum liquid crystal phases and unconventional magnetism in electronic and atomic fermi systems
This thesis is devoted to the study of quantum liquid crystal phases in metallic systems and itinerant Fermi systems with dipole-dipole interactions. It is based on published works of Refs. [65, 193, 68, 67, 66]. In the first part of the Thesis, I present the construction of a generalization of the …
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Collective excitations in low dimensional systems and stochastic control of population growth in a fluctuating environment
… the first area, I construct an effective field theory to describe Bose-Einstein Condensate (BEC) realized in an external potential. This theory explicitly explores the idea of spontaneous symmetry breaking and its application in the description of phase transitions of confined systems. Based on …
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Non-perturbative approaches to strongly correlated electron systems
… a non-perturbative analysis because Fermi liquid theory inevitably breaks down due to the strong correlation. In this thesis, we will study two non-perturbative approaches to tackle strongly correlated electronic system: 1.) multi-dimensional bosonization and 2.) the AdS/CFT correspondence. …
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Coulomb Correlations in Equilibrium and Nonequilibrium Many -Fermion Systems
… question at the frontier of Condensed Matter Theory namely when does Fermi liquid theory break down and when it does what new physical principles need to be invoked in order to understand physical phenomena in this new and uncharted regime.
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Coulomb correlations in equilibrium and nonequilibrium many-Fermion systems
… question at the frontier of Condensed Matter Theory namely when does Fermi liquid theory break down and when it does what new physical principles need to be invoked in order to understand physical phenomena in this new and uncharted regime.
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Thermal conductivity of liquid helium three
We have measured the thermal conductivity of liquid He3 at low pressure from O. 055 0 K to O. 47 o K, at 99.8 psi from O. 0550 K to O. 750 K and at 396.8 psi from O. 0550 K to O. 87 o K. At all pressures and at sufficiently low temperatures the thermal conductivity increases with decreasing …
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Quantum transport in strongly interacting, ultracold fermi gases in box potentials
… that cannot be explained by a Fermi-liquid theory. We show the temperature dependence of all non-zero transport properties, which constitutes a complete characterization of transport phenomena in the spin-balanced, strongly-interacting Fermi gas. Our findings inform theories of …
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The influence of coulomb potential fluctuation on c-axis tunneling in cuprates
… approximation (RPA) and in the Landau-Fermi liquid theory. The extensions of the calculation to include the Coulomb interaction between CuO2 planes are done in this thesis to get a better description of c-axis transport for double-layered cuprates and single-layered cuprates. It turns out the …
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Applied fractionalization : quantum phases and phase transitions of strongly interacting systems
… of matter that don't fit paradigms such as Fermi liquid theory or Landau's theory of phase transitions. On the other hand, there are actual materials which are undoubtedly governed by strong interactions and indeed do not fit the conventional paradigms but whose behavior often doesn't quite match …
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Spin liquids, exotic phases and phase transitions
Spin liquid, or featureless Mott-Insulator, is a theoretical state of matter firstly motivated from study on High-Tc superconductor. The most striking property of spin liquids is that they do not break any physical symmetry, yet there are many types of them, meaning a phase transition is necessary …
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One-dimensional bosonization approach to higher dimensions
… The approach predicts the failure of Fermi liquid and an absence of long-range order in one-dimensions. The low-energy description of one-dimensional interacting systems is called the Tomonaga-Luttinger liquid theory. For example, the edges of quantum Hall systems are one-dimensional and …
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