Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 4: Low-Dimensional Systems: 1D - Theory

TT 4.4: Vortrag

Montag, 31. März 2014, 10:15–10:30, HSZ 201

Matrix product state formulation of frequency-space dynamics at finite temperatures — •Alexander C. Tiegel, Salvatore R. Manmana, Thomas Pruschke, and Andreas Honecker — Institut für Theoretische Physik, Georg-August-Universität Göttingen, Germany

We use the density-matrix renormalization group (DMRG) to compute dynamical correlation functions of one-dimensional strongly correlated quantum systems at finite temperatures. The approach allows for the frequency-resolved evaluation of experimentally relevant quantities like line shapes in neutron or light scattering experiments. As a proof of principle, we study finite-temperature spectral functions of spin-1/2 XXZ Heisenberg chains with Dzyaloshinskii-Moriya interactions in magnetic fields. Based on our results, we provide an outlook for further improvements and developments of finite-temperature DMRG approaches to dynamical response functions.