Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 66: Ultrafast Dynamics of Light-Driven Systems

TT 66.6: Vortrag

Freitag, 5. April 2019, 11:00–11:15, H2

Excitation Dynamics in the Antiferromagnetic Mott Insulator Ca₂RuO₄ — •Parmida Shabestari^1,2, Anita Mahinpei^1,2, Min-Jae Kim^1,2, Hao Chu^1,2, Maximillian Krautloher¹, Joel Bertinshaw¹, Bernhard Keimer¹, and Stefan Kaiser^1,2 — ¹Max Planck Institute for Solid State Research, Stuttgart, Germany — ²4th Physics Institute, Stuttgart University, Stuttgart, Germany

Among ruthenates, the antiferromagnetic Mott insulator Calcium Ruthenate, Ca₂RuO₄, has shown remarkable complexity in spin, orbital and phonon correlations. Strong spin-orbit coupling manifests in the form of a complex Phonon, Magnon and collective Higgs mode spectrum. Here we report on the transient dynamics after photo-excitation across the Mott gap, revealing saturation and depletion regimes. In addition we find a so far unknown coherent low frequency mode, which we characterize by Impulsive Stimulated Raman and Terahertz spectroscopy as a possible paramagnon.