Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 57: Ultrafast Electron Dynamics I
O 57.6: Vortrag
Mittwoch, 19. März 2025, 12:00–12:15, H2
Hybrid Frenkel-Wannier excitons facilitate ultrafast energy transfer at a 2D-organic interface — •Wiebke Bennecke1, Ignacio Gonzalez Oliva2, Jan Philipp Bange1, Paul Werner1, David Schmitt1, Marco Merboldt1, Anna M. Seiler1, Daniel Steil1, R. Thomas Weitz1, Peter Puschnig3, Claudia Draxl2, G. S. Matthijs Jansen1, Marcel Reutzel1, and Stefan Mathias1 — 1I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — 2Physics Department and CSMB, Humboldt-Universität zu Berlin, 12489 Berlin, Germany — 3Institute of Physics, NAWI Graz, University of Graz, 8010 Graz, Austria
The combination of two-dimensional transition metal dichalcogenides (TMDs) and organic semiconductors (OSCs) is a highly promising material platform for the realization of future optoelectronic devices. While the excitonic properties of their individual components have been intensively studied, much less is known about excitons at the hybrid interface. Here, we use ultrafast momentum microscopy and many-body perturbation theory to investigate the exciton landscape at the PTCDA/WSe2 interface [1]. In particular, we find an exciton state formed via Förster resonant energy transfer, which is of hybrid nature: Concomitant intra- and interlayer electron-hole transitions within the OSC layer and across the TMD/OSC interface, respectively, give rise to an exciton wavefunction with mixed Frenkel-Wannier character.
[1] Bennecke et al., arXiv:2411.14993 (2024)
Keywords: Photoemission Orbital Tomography; Ultrafast Momentum Microscopy; Hybrid Excitons