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TT: Fachverband Tiefe Temperaturen

TT 22: CE: Spin Systems and Itinerant Magnets

TT 22.1: Vortrag

Mittwoch, 24. März 2010, 09:30–09:45, H21

Hydrodynamic Limit for the Spin Dynamics of the Heisenberg Chain — •Wolfram Brenig and Simon Grossjohann — Institute for Theoretical Physics, Technical University Braunschweig

We show that Quantum-Monte-Carlo calculations of the dynamic structure factor of the spin-1/2 antiferromagnetic Heisenberg chain at intermediate temperatures based on the stochastic series expansion method corroborate predictions for a diffusive behavior of the spin-dynamics at finite frequencies in the low-energy long wave-length limit. The temperature dependence of the scattering rate will be detailed and will be shown to be in good agreement with similar findings by bosonization and DMRG methods. Implications for NMR and spin-transport measurements will be discussed.