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MA: Fachverband Magnetismus

MA 6: Ultrafast magnetism I

MA 6.7: Talk

Monday, March 12, 2018, 11:15–11:30, EB 407

Localized-spin dynamics from time-dependent correlation functions — •Kai Leckron and Hans Christian Schneider — University of Kaiserslautern, Department of Physics

We present a microscopic method for the calculation of spin dynamics in Heisenberg models with coupling to a phonon bath using time-dependent correlation functions. We discuss the general strategy to truncate the hierarchy of equations of motion and to obtain approximations at a given level of spin correlations. In this talk, we use an approximation scheme that is exact for the case of a three-spin system. The phonons are treated as a bath in this approach, where contributions of higher order are taken into account using a broadening of the bath interactions.

We apply this method to calculate the spin dynamics after an instantaneous switching of local spins in small ferromagnetically and antiferromagnetically coupled Heisenberg systems and we investigate the influence of the broadening on the magnetization dynamics.