Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 2: Ultrafast Electron Dynamics at Surfaces and Interfaces 1
O 2.2: Vortrag
Montag, 5. September 2022, 10:45–11:00, H3
Femtosecond orbital tomography of exciton dynamics in C60 thin films — •G. S. Matthijs Jansen1, Wiebke Bennecke1, Ralf Hemm2, Andreas Windischbacher3, David Schmitt1, Jan Phillip Bange1, Christian Kern3, Daniel Steil1, Sabine Steil1, Marcel Reutzel1, Martin Aeschlimann2, Peter Puschnig3, Benjamin Stadtmüller2,4, and Stefan Mathias1 — 1I. Physikalisches Institut, Georg-August-Universität Göttingen — 2Department of Physics and Research Center OPTIMAS, University of Kaiserslautern — 3Institute of Physics, University of Graz — 4Institute of Physics, Johannes Gutenberg-University Mainz
Time-resolved photoemission orbital tomography promises to be a unique probe of out-of-equilibrium electronic wavefunctions at the Ångström level and with femtosecond time resolution. Particularly interesting is the application to excitons, quasiparticles consisting of a bound electron and electron hole that govern the opto-electronic response of organic semiconductors. Here, we consider the prototypical organic semiconductor C60, for which it has been proposed that the exciton cascade involves the two-step decay of a delocalized charge-transfer exciton into a localized Frenkel excitonic state. We will discuss how the combination of multi-dimensional photoemission spectroscopy with calculations within the many-body perturbation theory framework of the Bethe-Salpeter equation can shed light on the real-space femtosecond electron dynamics, and in particular show how the delocalization of excitons in C60 evolves on the femtosecond timescale.