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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-TaS2Manuel 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 Bovensiepen11Faculty 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.

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