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.
Results
Showing 1 to 20 of 32 for “"kagome"”.
-
Quantum simulation with an optical kagome lattice
… atom- based quantum simulator for studying the kagome lattice and the associated flat band. Despite a copious amount of theoretical effort to elucidate the physics of the kagome lattice, experimental kagome physics is still in its infancy. In the case of ultracold atoms, this is mainly due to …
-
Quantum Materials based on the Kagome Lattice
… on the specific lattice geometry known as the kagome lattice. The insulating kagome lattices have been studied since the 1980s as a platform for novel quantum magnetic states. In the metallic case, the symmetry of the kagome lattice protects rich singularities in its electronic structure, …
-
In-plane magneto-crystalline anisotropy of magnetic kagome intermetallics
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
-
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 …
-
Negative temperature states of bosons in triangular and kagome lattices
… load the atoms into the optical triangular and kagome lattices at negative temperature, where most atoms occupy the states with the highest energy. Due to geometric frustration, the highest energy states are Bloch states at the K and K′ points for the triangular lattice and the states in the …
-
Engineering topology and correlation in epitaxial thin film kagome metals
… kinetic energies of individual constituents. The kagome lattice is a generalized lattice model whose characteristic atomic arrangement produces both topological Dirac bands and correlated flat bands. In search of its material realizations, kagome metals, a class of intermetallics containing the …
-
Bose-Hubbard physics in the kagome and triangular optical lattices at negative absolute temperature
… experiments with ultracold bosonic ³⁹K in the kagome and triangular optical lattices. These lattices display geometric frustration, which manifests itself in a degeneracy at the upper edge of the ground band manifold. In the case of the triangular lattice, the band structure features two …
-
Novel magnetic and superconducting states in spin-1/2 kagome lattice and its doped variant
… (OH)6 Cl2 , which can be modeled as a spin-1/2 kagome lattice. Theoretically, the U(1) Dirac spin liquid (U(1) DSL) state is shown to be a plausible description of the system, and previous works have indicate that this particular quantum spin liquid state may enjoy a host of interesting …
-
Thermodynamic and neutron scattering study of the spin- 1/2 kagome antiferromagnet ZnCu₃(OH)₆Cl₂ : a quantum spin liquid system
… state in the form of antiferromagnetic Cu2+ kagome planes. The x = 1 end member, named herbertsmithite, has shown promising spin liquid properties from prior studies on powder samples. Here we show a new synthesis by which high-quality centimeter-sized single crystals of Zn-paratacamite have …
-
Neutron scattering and thermodynamic studies of quantum magnetism on the kagomé lattice
The geometry of the kagome lattice leads to exciting novel magnetic behavior in both ferromagnetic 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 …
-
Phase Stabilised Superlattices for Quantum Simulation
… potassium and rubidium in the lowest band of the kagome lattice. We discuss the characterisation and validation of the apparatus as well as preliminary results towards probing the flat energy band of the kagome lattice, a key experimental goal of the group. A major obstacle to faithfully …
-
Magneto-thermal Transport and Machine Learning-assisted Investigation of Magnetic Materials
… have proven that some structures such as kagome or honeycomb lattices hosts such flat bands with non-trivial topology. Even though a number of theories suggest that such dispersionless mode exist in magnonic bands under the framework of the Heisenberg spin model, few experiments indicate …
-
Modeling of nonlinear ultrashort optical pulse propagation
… particularly that of modulational instability in Kagome-type hollow-core photonic crystal fibers.
-
An Investigation into Topological Crystals and Flat Band Systems
… investigated all incorporate the 2-dimensional Kagome lattice in their 3-dimensional structures, and include the materials Zr₂Fe₃(Si,Ge) and Fe₆Ge₆Zr. Synthesis campaigns for these candidate materials included the implementation of solid state reactions, flux growths, and chemical vapor …
-
Interaction effects in topological insulators
… insulator with extended Hubbard models on the kagome lattice and decorated honeycomb lattice. For the interplay among spin-orbit coupling, distortion and correlation effect in transition metal oxides, we use the slave-rotor mean-field approach to study its phase transition. We identify regimes …
-
The Chemistry and Crystallography of Doped Bixbyite, Braunite and Novel Anion-Deficient Fluorite Oxides
… coordination and is another example of a Cu Kagome staircase compound. From closer inspection it can be seen to be rationalised as being structurally related to the bixbyite-braunite-parwelite defective fluorite structures, likely the most complex of all. The remarkable coordination and …
-
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 …
-
Spin liquids, exotic phases and phase transitions
… I move to a much more realistic model: spin-1/2 Kagome lattice, where we propose a U(1)-Dirac spin liquid as the ground state. The implications on the recent material ZnCu3(OH)6C12 are discussed. Finally, I come back to the high-Tc problem. A doped spin liquid can naturally be superconducting …
-
Magnetic reversal of artificial spin ice
… magnetization reversal of connected kagome artificial spin ice will be demonstrated. I found the potentially interesting thermally-activated behavior from the transport measurement on the frustrated system. Investigations mentioned above illustrate the utility of artificial spin ice …
-
On numerical methods in quantum spin systems
… diagram of an extended Heisenberg model on a kagome lattice. Chapter 6 studies a quantum Heisenberg model on the stuffed honeycomb lattice. Phase transitions in quantum many body systems manifest themselves as a reorganization of low energy spectra of the system. They come in a variety of …
Page 1 of 2