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    Université de Fribourg

    Revealing Hund’s multiplets in Mott insulators under strong electric fields

    Dasari, Nagamalleswararao ; Li, Jiajun ; Werner, Philipp ; Eckstein, Martin

    In: Physical Review B, 2020, vol. 101, no. 16, p. 161107

    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 us to reveal specific signatures of local correlations in the time-resolved photoemission spectrum. In particular, we demonstrate...

    Université de Fribourg

    Theory of photoinduced ultrafast switching to a spin-orbital ordered hidden phase

    Li, Jiajun ; Strand, Hugo U.R. ; Werner, Philipp ; Eckstein, Martin

    In: Nature Communications, 2018, vol. 9, no. 1, p. 4581

    Photo-induced hidden phases are often observed in materials with intertwined orders. Understanding the formation of these non-thermal phases is challenging and requires a resolution of the cooperative interplay between different orders on the ultra-short timescale. In this work, we demonstrate that non-equilibrium photo-excitations can induce a state with spin-orbital orders entirely...