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O: Fachverband Oberflächenphysik
O 57: Ultrafast Electron and Spin Dynamics
O 57.2: Poster
Tuesday, March 21, 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.