SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 19: Poster: Ultrafast Electron Dynamics at Surface and Interfaces I
O 19.5: Poster
Monday, March 27, 2023, 18:00–20:00, P2/EG
Modification of the ultrafast charge carrier dynamics in a molecule/TMDC heterostructure — •Sebastian Hedwig1, Matthias Rüb1, Benito Arnoldi1, Kai Roßnagel3,4, Benjamin Stadtmüller1,2, and Martin Aeschlimann1 — 1Department of Physics, University of Kaiserslautern and Research Center OPTIMAS, 67663 Kaiserslautern, Germany — 2Institute of Physics, Johannes Gutenberg University Mainz, 55128 Mainz, Germany — 3Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24118 Kiel, Germany — 4Ruprecht Haensel Laboratory, Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
Tailoring the properties of layered van der Waals materials is one of the most intriguing challenges in the field of 2D materials. While for transition metal dichalcogenides (TMDCs) this is mainly achieved by the formation of heterostructures with other 2D materials, our approach is to functionalize the properties of TMDCs by the adsorption of molecular films. Here we present our recent fs-time-resolved optical-pump XUV-probe ARPES experiments on a C60/TiSe2 heterostructure. TiSe2 was selected since it can host a charge density wave phase at low sample temperature that can be melted by fs pulses [1]. We find a clear modification of the optically induced phase transition dynamics from the CDW into the semi-metallic phase. This observation is discussed in the light of interactions and the interfacial charge carrier dynamics at the C60/TiSe2 interface.
[1] Rohwer T., et al.; Nature, 471, 490, (2011)