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TT: Fachverband Tiefe Temperaturen

TT 53: Low-Dimensional Systems: 1D - Theory

TT 53.12: Talk

Wednesday, March 9, 2016, 18:00–18:15, H23

Time-dependence of Spin-Orbital Excitations in the one dimensional Kugel-Khomskii model — •Mirco Marahrens and Maria Daghofer — Institut für Funktionelle Materie und Quantentechnologien, University of Stuttgart, Stuttgart, Baden-Wuerttemberg, Germany

Using the technique of time-dependent Density Matrix Renormalization Group (tDMRG) we investigating the behaviour of spin and orbital dynamics in the Kugel-Khomskii model. The model couples an SU(2) algebra for the spin with and orbital degree of freedom, where a crystal field breaks SU(2) symmetry. For the case of an orbital splitting larger than the magnetic coupling, the ground state has anti-ferromagnetic (AFM) and ferro-orbital (FO) order. Initial states are prepared as deviations from this order, as might arise through a temporary quench of crystal field. An example that will be analyzed is the spin-orbit separated propagation of fractionalized elementary excitations [1]. We discuss ongoing work on this issue and the different aspects of the results obtained so far.
J. Schlappa et al., Nature 485, 82 (2012)