Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 79: Ultrafast Electron Dynamics III
O 79.1: Talk
Thursday, March 20, 2025, 10:30–10:45, H2
Hybrid Exciton Orbital Tomography in 2D-organic interfaces — •Christian Simon Kern1, Michele Capra2, Marco Gruenewald3, Torsten Fritz3, Mirko Cinchetti2, Peter Puschnig1, and Giovanni Zamborlini1 — 1Institute of Physics, University of Graz, Austria — 2Department of Physics, TU Dortmund University, Germany — 3Institute of Solid State Physics, Friedrich Schiller University Jena, Germany
Organic molecules adsorbed on semiconducting 2D substrates pose an interesting class of interfaces for optoelectronic applications. Here we investigate the interface of pentacene and a transition metal dichalco-genide layer with many-body perturbation theory. In particular, we compare those results to optical spectroscopy and demonstrate the connection of excitons to their experimentally observable photoemission signatures in pump-probe spectroscopy. The latter approach— exciton photoemission orbital tomography [1]—especially allows for the unambiguous characterization of the excitons’ hole and electron configuration, and is extended to the case of hybrid interlayer excitons.
[1] C. S. Kern, A. Windischbacher, and P. Puschnig, Photoemission orbital tomography for excitons in organic molecules, PRB 108, 085132 (2023)
Keywords: Excitons; Photoemission Orbital Tomography; pump-probe spectroscopy; Many-body perturbation theory; 2D materials