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TT: Fachverband Tiefe Temperaturen

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

TT 4.3: Vortrag

Montag, 31. März 2014, 10:00–10:15, HSZ 201

Finite temperature dynamics of Heisenberg spin chains with S ≥ 1/2 — •Thomas Köhler¹, Salvatore R. Manmana¹, Christoph Karrasch², Thomas Pruschke¹, and Andreas Honecker¹ — ¹Institut für Theoretische Physik, Georg-August-Universität Göttingen, 37077 Göttingen, Germany — ²Department of Physics, University of California, Berkeley, CA 95720, United States

We present results for spectral functions of one-dimensional Heisenberg systems at finite temperatures obtained via a density-matrix renormalization group (DMRG) matrix product state implementation with real-time evolution. We show results for systems with S=1/2 at zero and finite magnetic fields, as well as for systems with Dzyaloshinskii-Moriya anisotropy. At zero field, we discuss results for S=1 and S=2 and focus on the features realized in the dynamical structure factor at infinite temperature.