Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 8: Correlated Electrons: Spin Systems and Itinerant Magnets 1

TT 8.7: Vortrag

Montag, 25. Februar 2008, 15:45–16:00, H 0104

Spin and Singlet Dynamics of the S=1/2 Kagome Antiferromagnet — •Andreas M. Laeuchli¹ and Claire Lhuillier² — ¹IRRMA, EPF Lausanne, Switzerland — ²LPTMC, Universite P. & M. Curie, Paris, France

The kagome Heisenberg antiferromagnet with spin 1/2 has been the topic of many theoretical investigations. Most of these focused on groundstate properties or aiming at an explanation of the anomalous high density of singlet excitations. In this contribution we report on recent exact diagonalization studies concentrating on dynamical correlation functions. First the full dynamical spin structure factor S(q,omega) on 36 sites has been obtained. Then we also discuss the time dependent spin autocorrelation function as well as dynamical dimer-dimer correlation functions. All these results combined together point towards a highly fluctuating system, both in the singlet and the triplet channel. We conclude by a comparison with recent inelastic neutron scattering measurements on the Herbertsmithite compound.