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 43 for “"Quantum Materials"”.
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Exotic superconductivity in quantum materials
… We study new exciting properties of these materials and discuss possible microscopic mechanisms for exotic superconductivity. In Part I of this thesis, we explore the properties of two-component superconductors with strong spin-orbit coupling. Our study is motivated by the experiments on a …
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Quantum Materials based on the Kagome Lattice
… interactions between many constituents. Quantum materials refer to a subset of condensed matter systems whose emergent properties defy description from classical physics or low-level quantum mechanics. Quantum materials exhibit truly diverse and fascinating properties, ranging from …
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Cryogenic scanning transmission electron microscopy of quantum 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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Ultrafast spectroscopy and control of correlated quantum materials
In this thesis, I describe research completed during my Ph.D. on correlated condensed matter systems using ultrafast optics. I begin with a broad overview of this field, focusing specifically on the essential physics involved in ultrafast processes and how that physics may be utilized, in the sense …
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Nonlinear optical and photoemission spectroscopies of quantum materials
Quantum materials are characterized by a macroscopic behavior that does not have a clear classical counterpart. Among the experimental probes capable of exploring the exotic properties of quantum materials, ultrafast laser pulses can offer a perspective that is not readily accessible with other …
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Stoner magnetism and Berry phase in quantum materials
Two-dimensional solids often exhibit carrier bands with Berry phase in 𝑘 space, resulting in carriers behaving like spinning objects and generating orbital magnetization in position space. This thesis explores the impact of orbital magnetization arising in this way on the correlated electron …
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Novel Quantum Materials for Spintronic and Opto-Electronic Applications
<p>"Multi-functional quantum materials play a crucial role in the development of spintronics and opto-electronics, as their properties can greatly influence device performance. For instance, in spintronics, materials such as ferromagnetic half-metals, Giant Magnetoresistants (GMR), and magnetic …
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Structural and Magnetic Phases in Pressure-Tuned Quantum Materials
… The properties of low-dimensional magnetic materials, and how these systems respond as they are pushed toward a more three-dimensional nature is explored through studies of both the crystal and magnetic structures of the family of quasi-two-dimensional magnetic insulators MPS3 (M = Fe, Ni, …
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Controlling and probing nonlinear collective mode dynamics in quantum materials
… laser pulses offer a powerful means of driving materials out of equilibrium by selectively addressing specific degrees of freedom. In particular, the excitation of low-energy collective modes in solids—such as lattice vibrations (phonons) and spin precessions (magnons)—to large amplitudes opens …
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Femtosecond spectroscopy of coherent phenomena in quantum materials : a dissertation
Quantum materials are solids that cannot be described by the single-particle band models of conventional condensed matter physics. Rather strong inter-particle interactions and coupling between various degrees of freedom (charge, spin, orbital and lattice) lead to emergent phases such as …
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Non-classical methods for the simulation and design of quantum materials.
Materials science has transformed human technology, ranging from robust structural materials like steel alloys to the sophisticated semiconductor devices that drive modern electronics. Many of these materials can be studied and understood computationally through classical methods such as Density …
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MONITORING PHONON DYNAMICS IN QUANTUM MATERIALS BY TIME-RESOLVED SPONTANEOUS RAMAN SCATTERING
… to the study of phonon dynamics in photoexcited quantum materials, employing time-resolved spontaneous Raman spectroscopy (TRRS) as the primary experimental approach. Among ultrafast spectroscopies, TRRS provides unique access to phonons and other low-energy excitations in systems impulsively …
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Probing interfacial electronic structure in quantum materials using stem cathodoluminescence spectral imaging
Quantum information science (QIS) critically relies on materials that can generate, process, and sense quantum states with high fidelity at scales. The development of quantum material requires measurements that can connect atomic registry, symmetry, and local electromagnetic fields to optical and …
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Ultrafast dynamics in quantum materials probed by time-and-momentum-resolved techniques
The interactions of quasiparticles in quantum materials give rise to intriguing phenomena, including magnetism and superconductivity. However, these interactions are often challenging to understand due to the intertwining of multiple degrees of freedom, such as charge, spin, orbital, and lattice. …
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Ultrafast Terahertz Spectroscopy for the Manipulation and Elucidation of Correlated Quantum Materials
Light-matter interactions are at the heart of quantum mechanics. The photoelectric effect, blackbody radiation, and the hydrogen emission spectrum were all experimental observations using light and its interaction with matter which led to the discovery of the quantum mechanical nature of the …
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Ultrafast Probing of Nonlinear Dynamics in Quantum Materials: Beyond Linear Response Probes
… phenomena and emergent phases of matter in quantum materials. However, understanding these phenomena is often hindered by the lack of experimental probes that are sensitive to multiple degrees of freedom. Linear response probes, such as scattering and electron transport measurements, are …
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Laser-coupled scanning tunneling microscopy and spectroscopy of quantum materials and qubit defects
Capturing the dynamics of quantum materials simultaneously at their intrinsic timescales and lengthscales has remained a long-sought goal in condensed matter physics. Laser-coupled scanning tunneling microscopy has provided a possible means to achieve this goal. However, to date, laser-coupled STM …
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High pressure studies of superconductivity and anomalous normal states in novel quantum materials
… parameters for accessing or tuning away from the quantum critical point but also to enter novel phases that cannot usually be found in any materials at ambient conditions. Sb (Chapter 4): High-pressure phase Sb-II exhibits a novel incommensurate host-guest structure, giving rise to exotic sliding …
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Light-induced States and Phase Transitions in Quantum Materials investigated by Photoemission Spectroscopy and Epitaxial Synthesis
… understanding of light-matter interactions in quantum materials.
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Quantum chaos and phase transitions
Quantum materials permeate the modern world - these are systems that exhibit quantum mechanical properties, like topological phases and superconductivity, at macroscopic scales. The principles governing quantum materials include entanglement and coherence -phenomena which are fundamentally quantum …
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