SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 19: Poster: Ultrafast Electron Dynamics at Surface and Interfaces I
O 19.6: Poster
Montag, 27. März 2023, 18:00–20:00, P2/EG
Analysis of Nonlocal Correlations in 1T-TaS2 Driven Out of Equilibrium — •Jesumony Jayabalan1, Florian K. Diekmann2, Ping Zhou1, Kai Roßnagel2, and Uwe Bovensiepen1 — 1Fakultät für Physik, Universität Duisburg-Essen, Germany — 2Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Germany
Driving correlated materials out of equilibrium on ultrafast time scales can provide information about the correlation phenomena and their complex free energy landscapes. Time- and angle-resolved photoemission spectroscopy provided access to the ultrafast dynamics of Doublons [Ligges et al., PRL 120, 166401 (2018)] and concluded on presence of empty and doubly occupied sites at few tens of femtosecond timescales which match calculated spectra with 5% static hole doping. Thus the doublon decay was concluded to be mediated in 1T-TaS2 by the presence of holes. We propose experiments aimed at a doping dependent relaxation dynamics measurements that would reveal the role of screening and charge excitations on such photo-induced states. Two different approaches will be used for doping: 1) 1T-TaS2 crystals are grown by Ta substitution to induce a less than half filled band and hole doping and 2) surface doping by adsorption of alkali adsorbates on the cleaved 1T-TaS2 surface. Such doping depending studies at the timescale of the charge density wave amplitude mode potentially allow to examine the role of strong correlations in the coupled electron-lattice dynamics of 1T-TaS2 as well as possibilities to control two-dimensional correlated surfaces via photo excitation of the substrate.