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Fictitious spin waves in a frustrated classical antiferromagnet

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In the last decades the classical Heisenberg antiferromagnet on the kagome lattice has been subject of a number of theoretical and numerical studies and today its behavior is widely understood. A prominent feature is ‘ordering by disorder’ meaning the entropy-driven formation of a highly degenerate coplanar state at low temperatures. For the coplanar regime a recent numerical study using standard spin dynamics techniques suggests the existences of an optical branch of spin waves while analytical investigations predict only acoustic modes. We were able to show how this discrepancy arises from different descriptions of the system and that the structure of the low-temperature state causes shifts in Fourier space, thus creating a fictitious optical branch.

This talk is part of the Quantum Matter Seminar series.

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