Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 79: Poster: Ultrafast Electron and Spin Dynamics at Interfaces

O 79.3: Poster

Mittwoch, 14. März 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.