Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 6: Many-Body Quantum Systems (joint session DY/TT)

DY 6.6: Vortrag

Montag, 20. März 2017, 11:30–11:45, ZEU 118

Direct observation of electronic, spin and charge separation in the ultrafast dynamics of LaCoO₃ — •Manuel Izquierdo^1,2, Alexander Yaroslavtsev^1,2, Robert Carley¹, Michael Karolak^3,2, Alexander Lichtenstein^2,1,4, Andreas Scherz¹, and Serguei Molodtsov^1,5,6 — ¹European XFEL GmbH, Albert-Einstein-Ring 19, 22761 Hamburg, Germany — ²Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, 20355 Hamburg, Germany — ³Theoretical Physics I, University of Würzburg, Am Hubland, 97074 Würzburg — ⁴Ural Federal University, 620990 Yekaterinburg, Russia — ⁵Institute of Experimental Physics, Technische Universität Bergakademie Freiberg, 09599 Freiberg, Germany — ⁶ITMO University, Kronverkskiy pr. 49, 197101 St. Petersburg, Russia

The semiconductor to metal transition of LaCoO₃ (LCO) is investigated with all-optical and optical-soft x-ray pump-probe experiments performed with different time resolution. Picosecond studies have demonstrated the formation of a laser-induced transient metallic state. All-optical studies with femtosecond resolution have shown an ultrafast excitation of the system within a few hundred fs. Finally, spectroscopic studies with soft x-ray femtoslicing pulses have unraveled the properties of the transient metallic state, in which the electronic, spin and lattice degrees of freedom are excited on different time scales, demonstrating the relevance of soft x-ray femtosecond sources to investigate correlated systems.