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 16 of 16 for “"Quantum spin liquid"”.
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Thermodynamic and neutron scattering study of the spin- 1/2 kagome antiferromagnet ZnCu₃(OH)₆Cl₂ : a quantum spin liquid system
New physics, such as a quantum spin liquid, can emerge in systems where quantum fluctuations are enhanced due to reduced dimensionality and strong frustration. The realization of a quantum spin liquid in two-dimensions would represent a new state of matter. It is believed that spin liquid physics …
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Exotic phases and quantum criticality in gapless correlated electron systems
… a gauge field, can be addressed. Thirdly, in a quantum spin liquid phase that is likely to be realized in certain organic Mott insulators. Here we show how such a phase can be accessed from a low energy description of a metal, without resorting to slave-particle constructions. Methodologically, …
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Understanding, constructing, and probing highly-entangled phases of quantum matter
In this thesis, I explore three classes of quantum phases of matter that cannot be understood purely on the basis of symmetry, and can be regarded (to varying degrees) as having highly-entangled ground-states. The first Part describes topological superconductors with non-Abelian defects, and …
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Dual mappings and phase transitions in a short-range random valence bond theory
… the melting from a Valence-Bond Crystal to a Quantum Spin Liquid. To demonstrate the existence of one or both of these phase transitions, I have proformed numerical simulations using Monte Carlo. The confinement/deconfinement phase transition is tracked using both hysteresis and Wilson loop …
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Mocking quantum mechanics: Semiclassical and machine-learning approaches to frustrated magnetism
Many-body quantum mechanics is the fundamental theory behind many areas of modern science, such as condensed-matter physics, nuclear physics, and quantum chemistry. It is also notoriously hard: the classical picture of particles with well-defined positions and velocities is replaced by an intricate …
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Exotic Phenomena Emerging from Localized Multipolar Degrees of Freedom
… offers the opportunity for exotic macroscopic quantum phenomena. Multipolar moments, higher order generalizations of the familiar dipole, present a unique avenue for the discovery of a variety of exotic and novel phases of matter. These anisotropic charge and magnetization densities provide …
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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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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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Magnetic phases of large-spin ultracold bosons: quantum dimer models and spin liquid phases
… investigates the plausibility of producing a quantum spin liquid (QSL) with ultracold bosonic atoms optically confined to the Mott insulating state. QSLs have received a great deal of attention for being an antiferromagnetic groundstate with many exotic properties, including the absence of …
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Frustration from Frustration: Field Tuning, Vison Crystallisation, and Disorder in Quantum Spin Ice
Quantum spin ice (QSI) is one of the oldest and most widely known models of a U(1) quantum spin liquid – a fascinating phase of matter in which quantum electrodynamics emerges at low energies in a frustrated magnet. This playground for alternate-universe electromagnetism exhibits many phenomena …
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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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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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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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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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Exploring Quantum Phenomena in 2D Materials: From Valley Topology and Exciton Selection Rules to Tuning Magnetic Correlations
… two independent parts under the common theme of quantum phenomena in 2D materials: Part I introduces a gauge-invariant, quantized interband index for multiband 2D systems and uses it in two applications: A) to analyze valley topology, and B) to derive gauge-invariant exciton selection rules. Part …
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Exotic phenomena in rare-earth based geometrically frustrated magnets
… frustrated magnets are ideal systems to explore quantum effects in materials, which are paramount for the development of quantum computers, MRAM, and other next-generation technology. RE based materials are of specific interest due to the strong spin-orbit coupling and crystal electric field …