Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 53: Low-Dimensional Systems: 1D - Theory
TT 53.3: Vortrag
Mittwoch, 9. März 2016, 15:30–15:45, H23
Finite-temperature dynamics of Spin-1 Heisenberg chains via Matrix Product States — Thomas Köhler1, Alexander Tiegel1, •Salvatore R. Manmana1, and Andreas Honecker2 — 1Institut für Theoretische Physik, Universität Göttingen, 37077 Göttingen — 2LPTM, Université de Cergy-Pontoise, France
The S=1 Heisenberg chain is an archetypal model of quantum magnetism that realizes a 1D symmetry protected topological (SPT) insulator which is adiabatically connected to the AKLT state. Here, we investigate in detail the temperature dependence of dynamical spectral functions for S=1 Heisenberg chains using finite-temperature Matrix Product State (MPS) approaches. By applying open boundary conditions (OBC), we are able to investigate for signatures of the edge states and their evolution upon increasing the temperature.
Financial support via DFG through CRC 1073 "Atomic scale control of energy conversion", project B03, and by the Helmholtz Virtual Institute "New States of Matter and their Excitations", project P6, is gratefully acknowledged.