Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster: Ultrafast Electron Dynamics at Surfaces and Interfaces

O 36.14: Poster

Dienstag, 19. März 2024, 18:00–20:00, Poster C

Photoemission electron microscopy of exciton dynamics in thinfilm TMD materials — •Lina Hansen, Kerstin Harland, Katrin Meier, Arvid Klösgen, and Jan Vogelsang — Institut für Physik, Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany

Atomically thin layers of transition metal dichalcogenide (TMD) materials offer unique optical properties through their excitonic effects in the reduced dimensions. The resulting enhanced light-matter interactions are based on the arising excitons with long lifetimes being the main mechanism for light emission and recombination processes.

Using a photoemission electron microscope (PEEM) with optical excitation in the visible, near-infrared and extreme ultraviolet spectral region, thinfilm TMD materials are studied. In a first step, our investigations focus on exciton diffusion dynamics at structural interfaces. In particular, we utilize the unique tight focusing capabilities of our set-up to locally excite excitons in the laterally heterogenous TMD material and reveal the spatial behavior of the exciton decay.

Keywords: TMD matieral; XUV; PEEM