Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Low-dimensional Systems: Models

TT 25.6: Vortrag

Dienstag, 8. März 2005, 11:15–11:30, TU H2053

Heat Transport in Almost Integrable Spin-Chains — •Peter Jung, Rolf Helmes, and Achim Rosch — Institute of Theoretical Physik, Cologne University, Zülpicher Str. 77, 50937 Köln, Germany

Integrable quantum spin chains are characterized by an infinite heat conductivity. We study the effect of small perturbations which destroy integrability. We evaluate a perturbation theory for 1/κ(T,ω) using both exact diagonalization and a high temperature expansion which reconstructs the relevant correlation functions from its moments.