Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 23: Poster Ultrafast Electron Dynamics

O 23.16: Poster

Montag, 17. März 2025, 18:00–20:00, P2

Towards momentum microscopy of plasmon excited WSe₂ — •Mattis Langendorf¹, Paul Werner¹, Marco Merboldt¹, Jan Philipp Bange¹, Wiebke Bennecke¹, Jonas Pöhls¹, Tobias Meyer², Thomas R. Weitz¹, Marcel Reutzel¹, and Stefan Mathias¹ — ¹Georg-August-Universität Göttingen, I. Physikalisches Institut, Germany — ²Georg-August-Universität Göttingen, Institut für Materialphysik, Germany

Femtosecond momentum microscopy represents a uni measurement technique that effectively integrates the advantages of angle-resolved photoemission spectroscopy (ARPES) and photoelectron emission microscopy (PEEM) within a single microscope. The capacity to transition between real- and momentum-space imaging in time-resolved photoelectron spectroscopy enables the investigation of quasiparticles in both regimes [Bange et al., Nature Photonics, in press (2024)]. In this contribution, we pursue the characterization of electron-hole pairs, i.e. excitons, which were excited by a collective excitation of charge carriers, i.e. a surface plasmon polariton (SPP). In this approach, the propagating SPPs are imaged with photoemission electron microscopy, and the formation of excitons in the TMD is then visualized with time-resolved dark-field imaging techniques.

Keywords: Ultrafast momentum microscopy; trARPES; plasmonics; light-matter interaction; TMD heterostructures