Transport in quasi one-dimensional spin-1/2 systems
Materials Sciences and Technology Division, Oak Ridge National Laboratory, Tennessee 37831,, University of Tennessee, Knoxville, Tennessee, 37996, USA
2 Institut für Theoretische Physik, Universität Göttingen, 37077 Göttingen, Germany
3 Technische Universität Braunschweig, Institut für Theoretische Physik, Mendelssohnstrasse 3, 38106 Braunschweig, Germany
Corresponding author: email@example.com
We present numerical results for the spin and thermal conductivity of one-dimensional (1D) quantum spin systems. We contrast the properties of integrable models such as the spin-1/2 XXZ chain against nonintegrable ones such as frustrated and dimerized chains. The thermal conductivity of the XXZ chain is ballistic at finite temperatures, while in the nonintegrable models, this quantity is argued to vanish. For the case of frustrated and dimerized chains, we discuss the frequency dependence of the transport coefficients. Finally, we give an overview over related theoretical work on intrinsic and extrinsic scattering mechanisms of quasi-1D spin systems.
© EDP Sciences, Springer-Verlag, 2007