Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 51: Ultrafast Dynamics of Light-Driven Systems (joint session TT/MA)
MA 51.8: Talk
Thursday, March 19, 2020, 17:00–17:15, HSZ 201
Revealing Hund’s multiplets in Mott insulators under strong electric fields — •Nagamalleswararao Dasari1, Jiajun Li1, Philipp Werner2, and Martin Eckstein1 — 1Department of Physics, University of Erlangen-Nuremberg, 91058 Erlangen, Germany — 2Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland
We investigate the strong-field dynamics of a paramagnetic two-band Mott insulator using real-time dynamical mean-field theory. We demonstrate that strong electric fields can lead to a transient localization of electrons. This nonequilibrium quantum effect allows to reveal specific signatures of local correlations in the time-resolved photoemission spectrum. In particular, we demonstrate that the localization can be strong enough to produce atomic-like spin multiplets determined by the Hund’s coupling J, and thus provide a way of measuring J inside the solid. Our simulation also fully incorporates non-linear field-induced tunnelling processes, which would lead to a dielectric breakdown in the steady state limit. A careful analysis of these processes however shows that they remain weak enough and do not prevent the measurement of the transiently localized spectra.