Quasiperiodic Heisenberg antiferromagnets in two dimensions |
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Authors: | A Jagannathan |
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Institution: | 1.Laboratoire de Physique des Solides, CNRS-UMR 8502,Université Paris-Sud,Orsay,France |
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Abstract: | We describe some of the properties of 2d quantum quasiperiodic antiferromagnets as reported in studies that have been carried
out in the last decade. Many results have been obtained for perfectly ordered as well as for disordered two dimensional bipartite
quasiperiodic tilings. The theoretical methods used include spin wave theory, and renormalization group along with Quantum
Monte Carlo simulations. These methods all show that the ground state of these unfrustrated antiferromagnets have Néel type
order but with a highly complex spatial distribution of local staggered magnetization. The ground state properties, excitation
energies and spatial dependence, structure factor, and local susceptibilities are presented and discussed. The effects of
introducing geometrical disorder on the magnetic properties are discussed. |
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Keywords: | |
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