Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 79: Poster: Ultrafast Electron and Spin Dynamics at Interfaces
O 79.3: Poster
Wednesday, March 14, 2018, 18:15–20:30, Poster A
Time-domain identification of electronic correlations in 1T-TaS2 — Manuel Ligges1, Isabella Avigo1, Denis Goleš2, Hugo Strand2, •Yasin Beyazit1, Kerstin Hanff3, Florian Diekmann3, Ljupka Stojchevska1, Matthias Kalläne3, Ping Zhou1, 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
We used time-resolved photoemission spectroscopy to isolate and access fundamental Mott-physics in the (quasi) 2D transition-metal dichalcogenide 1T-TaS2. Doublon-holon recombination is found to occur on time scales as short as only a few electronic hopping cycles ℏ/J. Despite strong electron-phonon coupling, the dynamics can be reproduced within a single-band Hubbard model in the absence of additional bosonic coupling channels. We furthermore find that hole-doping governs the relaxation dynamics on ultrashort time scales.