Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Magnetization / Demagnetization Dynamics II
MA 35.5: Vortrag
Mittwoch, 18. März 2015, 16:00–16:15, EB 301
Spin oscillations triggered by strongly correlated t2g electrons at the timescale of electron-electron interactions — •Malte Behrmann and Frank Lechermann — I. Institut für Theoretische Physik, Universität Hamburg, 20355 Hamburg, Germany
Laser-induced ultrafast (fs) magnetization experiments in antiferromagnets have recently attracted large attention, paving the road for inherently fast spin dynamics in the THz regime without invoking stray fields. The technical importance is emphasized by the rising new research field of antiferromagnetic (AFM) spintronics, where superexchange-dominated strongly correlated compounds provide an interesting materials playground. Then an intriguing question is, whether the Coulomb interaction may be a key to control AFM order on ultrafast timescales. Therefore we here study (de)magnetization processes in a time-dependent multi-orbital Hubbard model, focusing on t2g electrons in a wider doping range. We reveal novel filling-dependent stable/transient spin oscillations via interaction quenches from the antiferro- or paramagnetic state. Non-equilibrium ultrafast spin-orientation effects in prominent correlated transition-metal oxides are therefrom predicted, which could be detected by THz emission spectroscopy.