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 41 for “"Correlated electron systems"”.
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Magnetism in strongly correlated electron systems
… very different examples of magnetism in strongly correlated electron systems, the high-T$\sb{c}$ materials and heavy fermions.
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Frustrated Magnetism in Strongly Correlated Electron Systems
… corresponding excitations in several strongly correlated electron systems, where exotic orderings can be induced as a result of magnetic frustration and quantum fluctuations. We show that emergent spin textures can arise close to a magnetic field-induced quantum critical point, when the single …
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Anistropic phenomena in strongly correlated electron systems
… concerned with momentum anisotropy in strongly correlated electron systems, and explores its origin and its consequences through two contrasting projects. The first is a study of the temperature dependences of magnetotransport quantities in the normal state of the cuprate high-temperature …
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Spectral properties of strongly correlated electron systems
… of the cluster-perturbation theory (CPT) to systems with spontaneous broken symmetry. Our method accounts for both short-range correlations and long-range order. Short-range correlations are accurately taken into account via the exact diagonalization of finite clusters. Long-range order is …
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Renormalization-group theory of correlated electron systems
… renormalization-group theory to a variety of correlated electron systems, determining finite-temperature phase diagrams and thermodynamic properties for electron densities both at and away from half-filling. We begin by assessing the effectiveness of the Suzuki-Takano quantum decimation method …
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Non-perturbative approaches to strongly correlated electron systems
"Strong electron correlation phenomena are ubiquitous, such as unconventional superconductivity and the metal-insulator transitions. Having a proper understanding of strongly correlated electron systems requires a non-perturbative analysis because Fermi liquid theory inevitably breaks down due to …
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Field theoretical methods for strongly correlated electron systems
… computational tool to study quantum many-body systems. They have been applied successfully to the study of various systems of strongly correlated electrons in condensed matter physics, particularly to problems where a non-perturbative treatment is required.
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Field theoretical methods for strongly correlated electron systems
… computational tool to study quantum many-body systems. They have been applied successfully to the study of various systems of strongly correlated electrons in condensed matter physics, particularly to problems where a non-perturbative treatment is required. In the first part of this thesis we …
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High magnetic field study of strongly correlated electron systems
The physics of strongly correlated electron systems is remarkably rich and complex with the interactions between electrons giving rise to a diverse range of physical phenomena including ferromagnetism, metal-insulator transition and superconductivity. Observation of quantum oscillations in the …
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Phases and phase transitions of strongly correlated electron systems
Different experiments on strongly correlated materials have shown phenomena which are not consistent with our conventional understandings. We still do not have a general framework to explain these properties. Developing such a general framework is much beyond the scope of this thesis, but here we …
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Exotic phases and quantum criticality in gapless correlated electron systems
… than arise due to strong interactions between electrons in three different scenarios. Firstly, at a stripe melting phase transition, which may be relevant for the high temperature superconductors, where we propose a specific type of transition which produces critical exponents agreeing with …
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Insights into correlated electron systems from first-principles quantum Monte Carlo
… of accuracy required is difficult to reach in systems where it is important to properly account for electron correlations. I report several benchmarks establishing that variational Monte Carlo (VMC) and fixed-node diffusion Monte Carlo (FN-DMC) are efficient enough to compute properties of …
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Local Magnetism in Strongly Correlated Electron Systems with Orbital Degrees of Freedom
… behavior and the microscopic physics of strongly correlated electron systems with orbital degrees of freedom through the use of effective models. My dissertation focuses on the sub-class of these materials where electrons appear to be localized by interactions, and magnetic ions have well measured …
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Collective modes in strongly correlated electron systems measured with momentum-resolved electron energy-loss spectroscopy
"Strongly correlated electron systems comprise an exciting area of research in condensed matter physics due to the variety of quantum phenomena that results from the strong interactions between the electrons. Strongly correlated materials can be described in terms of weakly interacting, emergent …
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Probing the Dynamics of Pressure- and Magnetic Field -Tuned Transitions in Strongly-Correlated Electron Systems: Raman Scattering Studies
… regime, characterized by a collision-dominated electronic scattering response whose scattering rate Gamma decreases with decreasing temperature; (ii) a spin-disorder scattering regime, characterized by a collision-dominated electronic scattering response whose scattering rate Gamma scales with …
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Probing the Dynamics of Pressure- and Magnetic Field-Tuned Transitions in Strongly-Correlated Electron Systems: Raman Scattering Studies
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-11-14T18:28:15Z No. of bitstreams: 1 Snow.pdf: 3451521 bytes, checksum: f6b858e45e4088e9d889105256441889 (MD5)
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Strongly Correlated Electrons on a Triangular Lattice
… we are going to study the properties of strongly correlated electron systems (SCES) using analytical, phenomenological and computational methods. In the introductory chapter we will discuss generally the problem of strongly correlated electron systems and the methods that are used to analyse their …
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