Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 31: Ultrafast Electron and Spin Dynamics

MA 31.2: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-EG

Ultrafast Doublon Dynamics in 1T-TaS₂ — •Manuel Ligges¹, Isabella Avigo¹, Denis Goleš², Matthias Kalläne³, Kai Rossnagel³, Martin Eckstein⁴, Phillip Werner², and Uwe Bovensiepen¹ — ¹Faculty of Physics, Universität Duisburg-Essen — ²Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland — ³Institute of Experimental and Applied Physics, Universität Kiel, 24098 Kiel — ⁴Max Planck Research Department for Structural Dynamics, University of Hamburg-CFEL, 22761 Hamburg

Using time- and angle-resolved photoemission we study photo-induced electron dynamics in the (quasi-)2D Mott insulator 1T-TaS₂. In the low excitation limit, we observe population and subsequent decay dynamics of the upper Hubbard band that are significantly faster than expected, indicating a characteristic time scale of ℏ/J for the underlying scattering processes. Theoretical calculations based on dynamic mean field theory indicate that such dynamics only occur when the system is effectively hole-doped. We furthermore stress that on these time scales the electronic and phononic subsystems are decoupled.