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TT: Fachverband Tiefe Temperaturen
TT 50: Correlated Electrons: Frustrated Magnets - Theory
TT 50.6: Talk
Wednesday, March 9, 2016, 16:30–16:45, H18
Finite temperature dynamics of spin-1/2 chains with symmetry breaking interactions — Alexander C. Tiegel1, •Salvatore R. Manmana1, Thomas Pruschke1, and Andreas Honecker2 — 1Institut f. Theor. Physik, Univ. Göttingen, 37077 Göttingen — 2LPTM, Université de Cergy-Pontoise, France
I will discuss recent developments for flexible matrix product state (MPS) approaches to calculate finite-temperature spectral functions of low-dimensional strongly correlated quantum systems. The main focus will be on a Liouvillian formulation [1]. The resulting algorithm does not specifically depend on the MPS formulation, but is applicable for any wave function based approach which can provide a purification of the density matrix, opening the way for further developments of numerical methods. Based on MPS results for various spin chains, in particular systems with Dzyaloshinskii-Moriya interactions caused by spin-orbit coupling and dimerized chains, I will discuss how symmetry breaking interactions change the nature of the finite-temperature dynamic spin structure factor obtained in ESR [2] and neutron scattering experiments.
A.C. Tiegel et al., PRB 90, 060406(R) (2014)
A.C. Tiegel et al., arXiv:1511.07880 (submitted to PRB)