Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

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

O 36.12: Poster

Tuesday, March 19, 2024, 18:00–20:00, Poster C

Towards time- and angle-resolved photoemission spectroscopy of plasmon enhanced van-der-Waals heterostructures — •Mattis Langendorf, Marco Merboldt, Jan Philipp Bange, Wiebke Bennecke, Paul Werner, David Schmitt, Jonas Pöhls, Anna Seiler, Thomas R. Weitz, Marcel Reutzel, and Stefan Mathias — Georg-August-Universität Göttingen, I. Physikalisches Institut, Germany

Light matter interaction in metals is mostly determined by a collective excitation of the charge carrier density, a quasiparticle called plasmon. For the case of surface plasmon polaritons (SPPs) that are localized at the surface-vacuum interface, the SPPs can be used to excite excitons in two-dimensional transition metal dichalcogenides (TMDs) that have been exfoliated onto the metal substrate. With this contribution, we work towards the characterization of the ultrafast exciton dynamics in TMDs that have been excited by SPPs. So far, femtosecond momentum microscopy had been used to study the optically excited exciton dynamics in TMDs [1]. Here, our approach is to image the propagating SPPs with photoemission electron microscopy and then to visualize the formation of excitons in the TMD with dark-field imaging techniques [2].

[1] Schmitt, Bange et al., Nature 608, 499-503 (2022).

[2] Schmitt et al. arXiv.2305.18908 (2023).

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