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 30 for “"Correlated Materials"”.
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Ultrafast Terahertz Spectroscopy of Collective Excitations in Correlated Materials
Strongly correlated materials exhibit a multitude of exotic phases of matter. Originating from strong interactions between electrons, the properties of these systems are governed by a delicate balance among the lattice, charge, orbital, and spin degrees of freedom, leading to complex ground state …
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Improving first principles-based methods for correlated materials modeling
… limiting while studying transition-metal based correlated materials. The delocalization and static correlation errors inherent in such approximations makes it challenging to study these systems with their localized d electrons and their open shell character. Beyond transition-metals, an …
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X-Ray scattering investigations of subtle ordering in correlated materials
The interaction of many particles can lead to spectacular new phases of matter whose properties and collective excitations bear little resemblance to the individual particles and interactions. Understanding how the macroscopic state transforms from one phase to another provides key insights into …
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Nonlinear THz emission spectroscopy of spin and charge dynamics in correlated materials
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01
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Synchrotron radiation-based characterization of GaN- based MQW structures and strongly correlated materials
The following dissertation applies synchrotron radiation-based characterization techniques to the fields of gallium nitrides, multiferroic manganites, and self-assembled nano-domain oxide films. These material systems were chosen due to their unusual properties and potential device applications, …
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X-ray scattering studies of strongly correlated materials: orbital ordering in KCuF3 and stripe-like domain structures in BiFeO3 epitaxial thin films
The results of x-ray scattering experiments on orbitally ordered KCuF3 and periodic arrays of stripe-like ferroelectric domains in epitaxial thin films of multiferroic BiFeO3 are presented in this dissertation. Both resonant soft x-ray elastic scattering and non-resonant hard x-ray elastic …
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Magnetic-field- and pressure-tuned phases in LaxPryCa1−x−yMnO3 and Mn3O4: inelastic light scattering studies and single crystal growth
… I present our studies on two distinct strongly correlated materials: the manganese perovskites LaxPryCa1−x−yMnO3; and the manganese-based spinel Mn3O4. For this study, Raman (inelastic light) scattering spectroscopy was used as a main experimental technique because Raman scattering can provide …
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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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First-Principles Studies of Complex Oxide Materials
… first-principles methods to study complex oxide materials. The first part of the thesis deals with complex oxide materials that have applications as lithium-ion battery electrodes. In the second part, a new method for the calculation of vibrational properties of correlated materials, specifically …
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Ultrafast Terahertz Spectroscopy for the Manipulation and Elucidation of Correlated Quantum Materials
… of, or controlling various aspects of quantum materials, a class of materials whose macroscopic properties are only understood through quantum mechanics. Quantum materials are often categorized into two classes: topological materials or strongly correlated materials, though the cross-over and …
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Beyond particles and localities in quantum matters
Many properties of strongly correlated materials behave differently from those obeying the standard theory of metals. Explaining such anomalous properties may require one to consider a non-traditional model. In this dissertation, we construct several phenomenological models based on the notions of …
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Projector Quantum Monte Carlo Methods for Linear and Non-linear Wavefunction Ansatzes
… ansatzes and its application to strongly correlated materials. This new approach is partially inspired by a prior application of the Full Configuration Interaction Quantum Monte Carlo (FCIQMC) method to the three-band ($p-d$) Hubbard model. Through repeated stochastic application of a …
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Emergent Quantum Phenomena in Magic-Angle Twisted Graphene Superlattices
Strongly correlated electron systems have attracted considerable interest due to their ability to host a wealth of emergent quantum phenomena. Recently, moiré engineering, also known as twistronics, has emerged as a new approach for creating twodimensional correlated materials. In this thesis, I …
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Imaging magnetic order in magneto-structural phases of Mn3O4
… phase separation behaviors in related strongly correlated materials.
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THz spin dynamics in collinear antiferromagnets
Contains fulltext : 317916.pdf (Publisher’s version ) (Open Access)
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Computational modelling of the electronic and structural properties of chalcopyrite-type semiconductors and platinum group metal chalcogenides
… for use in photovoltaic systems is the design of materials with appropriate band gaps. Electronic structure calculations based on Density Functional Theory (DFT) have been extensively used to study and to describe such properties of many condensed matter systems. In this work, we have utilized DFT …
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Hubbard-corrected density functional theory : sensitivity to projection-space and renormalization of Coulomb interaction.
… has become a widely used framework for modeling materials in which localized d or f electrons give rise to strong electronic correlations. By introducing an explicit on-site Coulomb interaction, DFT+U can substantially improve the description of electronic structure, lattice properties, and phase …
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Probing spin, charge and lattice coupling in manganites
… of freedom. The characteristic feature of these materials is the existence of a ground state topology with many closely lying minima. The system can be switched from one minimum to another by the application of external parameters such as strain, temperature, magnetic fields, or electrical …
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The Study of Transition Metal Oxides using Dynamical Mean Field Theory
… the on-site interaction, electrons are much more correlated and cannot be described using traditional one-electron picture, thus the name "strongly correlated systems". With strong correlation, there exists a variety of interesting phenomena in these systems that attract long-standing interests …
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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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