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 23 for “"Spin liquids"”.
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Spin liquids : mean field and beyond
Spin liquids are fluid-like ground states of spin systems, where spins do not order at zero temperature. These states have long-range entanglement and concomitant exotic properties, such as fractionalized excitations and emergent gauge field. In this thesis we use mean field approach and its …
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Terahertz spectroscopy of quantum spin liquids
The optical properties of the spin-1/2 kagome lattice antiferromagnetic Herbertsmithite, ZnCu₃(OH)₆Cl₂, are studied by means of Terahertz Time-Domain Spectroscopy. Herbertsmithite is proposed to exhibit Quantum Spin Liquid behavior, in which electron spins have strong antiferromagnetic …
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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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Nonzero temperatures and emergent disorder in spin liquids
At absolute zero temperature, spin liquids are known to exhibit a fascinating array of phenomena including topological order, emergent gauge fields, and the existence of exotic quasiparticles with fractional statistics. Meanwhile, at temperatures that are high compared to all characteristic …
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Wonderland of frustration: Magnetic moments and itinerant electrons on the pyrochlore lattice
… range of intriguing quantum phenomena, including spin liquids, fractionalisation and long-range entanglement. In this thesis, we investigate the effects of frustration in magnetic systems on the pyrochlore lattice, looking at both the conventional frustrated magnetism as well as a less studied …
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Mocking quantum mechanics: Semiclassical and machine-learning approaches to frustrated magnetism
… two such strategies in the context of quantum spin liquids. In these materials, competition between incompatible interactions results in robust, massive entanglement, down to zero temperature. Such ground states give rise to a range of exotic behaviour, such as topological order and …
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Subdimensional particles and higher rank quantum phases of matter
Many quantum phases of matter, such as quantum spin liquids and fractional quantum hall systems, are well-described in the language of gauge theory. Until recently, most theoretical attention has been focused on systems described by familiar vector gauge theories. In this thesis, we will explore …
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Chern-Simons theory of magnetization plateaus on the kagome lattice
Frustrated spin systems on Kagome lattices have long been considered to be a promising candidate for realizing exotic spin liquid phases. Recently, there has been a lot of renewed interest in these systems with the discovery of experimental materials such as Volborthite and Herbertsmithite that …
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Novel Transition-Metal Oxides Under Pressure
… superconductors and Kitaev quantum spin liquids (KQSLs). In particular, the latter is a frustrated state of matter, modeled for 2D honeycomb lattices, that hosts topologically protected excitations and presents immense potential for application to fault-tolerant quantum computing. …
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A complex of interactions in rare-earth based quantum honeycomb magnets
Quantum spin liquids (QSLs) represent an exotic state of matter characterized by long-range quantum entanglement and fractionalized excitations. Although predicted theoretically by models such as the Kitaev honeycomb model, experimentally verifying these states in real materials remains a …
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Strongly Correlated 2D Electronic Systems: Interplay between Band Topology and Electron-electron Interaction
… Hubbard model and found that it can realize spin liquids and pseudo-gap metals [5]. On the “topological” side, there is difficulty in formulating a low energy effective lattice model, which comes from an obstruction to constructing symmetric, localized Wannier functions. We circumvented this …
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Neutron scattering and thermodynamic studies of quantum magnetism on the kagomé lattice
… and antiferromagnetic systems. The collective spin dynamics were investigated in a variety of magnetic materials featuring spin-1/2 and spin-1 moments on kagome lattices using neutron scattering and thermodynamic probes. Both ferromagnetic and antiferromagnetic systems were studied. Cu(1,3-bdc) …
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Inverse methods in quantum many-body physics
… types of topological phases of matter, quantum spin liquids with Wilson loops and topological superconductors with Majorana zero modes (MZMs). These phases have exotic properties, such as long-ranged entanglement and anyonic quasiparticles, that make them interesting to study and potentially …
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Low-dimensional and frustrated magnetism in complex lanthanide oxides
… as hosts for novel magnetic states such as spin liquids, and for applications such as magnetic refrigeration. In this thesis, three families of materials were studied in order to probe relationships between their structural and magnetic properties. First, the lanthanide calcium oxyborates …
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Slave particle study of the strongly correlated electrons
… 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 superconductivity. However, in the last thirty …
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Insights into correlated electron systems from first-principles quantum Monte Carlo
… I also found a coupling between the structure, spin texture, and orbital occupation in the system that may be relevant to explain some of the unique properties of that system. To establish its predictive capabilities, I also utilize FN-DMC to make a prediction for the singlet-triplet gap of …
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Novel magnetic and superconducting states in spin-1/2 kagome lattice and its doped variant
Quantum spin liquids, which are quantum ground states of interacting spin systems that break no symmetries, have long been a fascination among the theoretical condensed matter community. After years of experimental searches, several promising candidates finally emerged, including herbertsinithite …
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Investigating Topological Quantum Matter: Machine Learning Topological Phases, Topological Quantum Codes, Interplay of Disorder and Topology via Transport Phenomena and Phase Transitions
… disorder-driven band-topology. Part I, casts the spin-1/2 Kitaev honeycomb model into a neural framework by training a restricted Boltzmann machine (RBM) on stochastic-reconfiguration Monte-Carlo data. A custom PyTorch code with translation projection, split real/imaginary learning rates, and …
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Field theoretical methods for strongly correlated electron systems
… Quantum Antiferromagnet. We study the Chiral Spin Liquid state of the antiferromagnet at zerotemperature, which has a spin-gap generated by the spontaneous breakdown of time-reversalsymmetry. This state is known as the Chiral Spin State. We determine conditions for the restoration of …
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Numerical simulation of quantum spin systems and experimental optimization
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-12-01
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