The Experts below are selected from a list of 21 Experts worldwide ranked by ideXlab platform
Jeroen Van Den Brink - One of the best experts on this subject based on the ideXlab platform.
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Frustrated magnetism and resonating Valence Bond physics in two-dimensional kagome-like magnets
Physical Review B, 2013Co-Authors: Ioannis Rousochatzakis, Roderich Moessner, Jeroen Van Den BrinkAbstract:We explore the phase diagram and the low-energy physics of three Heisenberg antiferromagnets which, like the kagome lattice, are networks of corner-sharing triangles but contain two sets of inequivalent short-distance resonance loops. We use a combination of exact diagonalization, analytical strong-coupling theories, and resonating Valence Bond Approaches, and scan through the ratio of the two inequivalent exchange couplings. In one limit, the lattices effectively become bipartite, while at the opposite limit heavily frustrated nets emerge. In between, competing tunneling processes result in short-ranged spin correlations, a manifold of low-lying singlets (which can be understood as localized bound states of magnetic excitations), and the stabilization of Valence Bond crystals with resonating building blocks.
Raphael D. Levine - One of the best experts on this subject based on the ideXlab platform.
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Dynamics of the collisional electron transfer and femtosecond photodissociation of NaI on ab initio electronic energy curves
Chemical Physics Letters, 1996Co-Authors: Todd J Martinez, Raphael D. LevineAbstract:Abstract Ab initio dynamics on more than one electronic state is reported for the NaI system. This requires both a method for computing the electronic energy curves and their coupling and a matched method for propagating the equations of motion for the atoms. The long-range electron transfer (a ‘harpoon’ process) requires a particularly accurate electronic computation and many configurations are employed in a novel method which combines the advantages of the molecular orbital and Valence Bond Approaches. The computation is performed ‘on the fly’ with the required electronic input being generated at each nuclear separation reached the system.
Ioannis Rousochatzakis - One of the best experts on this subject based on the ideXlab platform.
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Frustrated magnetism and resonating Valence Bond physics in two-dimensional kagome-like magnets
Physical Review B, 2013Co-Authors: Ioannis Rousochatzakis, Roderich Moessner, Jeroen Van Den BrinkAbstract:We explore the phase diagram and the low-energy physics of three Heisenberg antiferromagnets which, like the kagome lattice, are networks of corner-sharing triangles but contain two sets of inequivalent short-distance resonance loops. We use a combination of exact diagonalization, analytical strong-coupling theories, and resonating Valence Bond Approaches, and scan through the ratio of the two inequivalent exchange couplings. In one limit, the lattices effectively become bipartite, while at the opposite limit heavily frustrated nets emerge. In between, competing tunneling processes result in short-ranged spin correlations, a manifold of low-lying singlets (which can be understood as localized bound states of magnetic excitations), and the stabilization of Valence Bond crystals with resonating building blocks.
Todd J Martinez - One of the best experts on this subject based on the ideXlab platform.
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Dynamics of the collisional electron transfer and femtosecond photodissociation of NaI on ab initio electronic energy curves
Chemical Physics Letters, 1996Co-Authors: Todd J Martinez, Raphael D. LevineAbstract:Abstract Ab initio dynamics on more than one electronic state is reported for the NaI system. This requires both a method for computing the electronic energy curves and their coupling and a matched method for propagating the equations of motion for the atoms. The long-range electron transfer (a ‘harpoon’ process) requires a particularly accurate electronic computation and many configurations are employed in a novel method which combines the advantages of the molecular orbital and Valence Bond Approaches. The computation is performed ‘on the fly’ with the required electronic input being generated at each nuclear separation reached the system.
Roderich Moessner - One of the best experts on this subject based on the ideXlab platform.
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Frustrated magnetism and resonating Valence Bond physics in two-dimensional kagome-like magnets
Physical Review B, 2013Co-Authors: Ioannis Rousochatzakis, Roderich Moessner, Jeroen Van Den BrinkAbstract:We explore the phase diagram and the low-energy physics of three Heisenberg antiferromagnets which, like the kagome lattice, are networks of corner-sharing triangles but contain two sets of inequivalent short-distance resonance loops. We use a combination of exact diagonalization, analytical strong-coupling theories, and resonating Valence Bond Approaches, and scan through the ratio of the two inequivalent exchange couplings. In one limit, the lattices effectively become bipartite, while at the opposite limit heavily frustrated nets emerge. In between, competing tunneling processes result in short-ranged spin correlations, a manifold of low-lying singlets (which can be understood as localized bound states of magnetic excitations), and the stabilization of Valence Bond crystals with resonating building blocks.
