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Showing 1 to 20 of 21 for “"kagome lattice"”.
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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 …
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Quantum Materials based on the Kagome Lattice
… quantum properties is based 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 …
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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 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 …
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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 …
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Negative temperature states of bosons in triangular and kagome lattices
… to study quantum many-body states in frustrated lattices. For the first time, we 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 …
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Phase Stabilised Superlattices for Quantum Simulation
… fermionic) atoms in interesting triangular superlattice structures. We show that this machine can reliably and stably produce samples of ultracold potassium and rubidium in the lowest band of the kagome lattice. We discuss the characterisation and validation of the apparatus as well as …
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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 …
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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 …
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Interaction effects in topological insulators
… the Kane-Mele model on the decorated honeycomb lattice and study the stability of topological insulator phase against different perturbations. We establish an adiabatic connection between a noninteracting topological insulator and a strongly interacting spin liquid in its Majorana fermion …
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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
… 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 …
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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 …
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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 …
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Dynamic Homogenization Of Linear Waves In Periodic Media And Origami-Inspired Structures
… the “activated” Bloch eigenstates of the lattice are iden- tified and classified depending on the multiplicity of participating energy levels. In the vicinity of an isolated dispersion surface (single energy level), an effective field equation with homogenized source term is formulated …
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Thermal activation, long-range ordering, and topological frustration of artificial spin ice
… the square geometry and present studies of the kagome lattice showing the highest yet degree of ordering observed in this fully frustrated system. We consider theoretical predictions of long-range order in ASI and use both our experimental studies and kinetic Monte Carlo simulations to evaluate …
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Design and experimental observation of topological states in photonic metasurfaces
… materials) whose topological properties rely on lattice or sublattice symmetries. These structures were fabricated in a thin silicon slab and their design could be adjusted for operating in almost any optical frequency range, from visible to mid-infrared. One type of topological insulators which …
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New perspectives on fractional quantum Hall physics
… perspectives: (1) the role of an underlying lattice and its symmetries in engendering novel FQH states, (2) the description of non-Abelian FQH states using recently developed field theory dualities, and (3) the use of entanglement entropy in characterizing interfaces of FQH states. In the …
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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 …
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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 …
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