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HL: Fachverband Halbleiterphysik

HL 29: Poster II

HL 29.90: Poster

Dienstag, 18. März 2025, 18:00–20:00, P1

Experimental scheme for high-order fluorescence-detected pump–probe micro-spectroscopy on monolayer MoS₂ — •Ruidan Zhu, Patrick Grenzer, Simon Büttner, Matthias Hensen, Tobias Hertel, and Tobias Brixner — Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

Monolayers of transition metal dichalcogenides (TMDCs) are two-dimensional (2D) semiconductors with fascinating optoelectronic properties. However, exciton–exciton interaction (EEI) sets a fundamental limit to optimizing the quantum efficiency of 2D materials under high exciton densities. In particular, EEI processes are frequently mixed with single-exciton dynamics, thereby complicating the elucidation of their underlying mechanisms. Here, we apply fluorescence-detected pump–probe spectroscopy [1] in a cryomicroscope to detect the exciton dynamics of monolayer MoS₂. By incorporating the high-order separation methods that we recently developed [2], we aim to isolate EEI dynamics from the single-exciton dynamics, other higher-order signal contributions, and non-resonant substrate responses. We present the fundamental concept, the experimental setup, and the first data.

[1] P. Malý and T. Brixner, Angew. Chem. Int. Ed. 2021, 60, 18867.

[2] P. Malý et al., Nature 2023, 616, 280.

Keywords: Pump--probe spectroscopy; Fluorescence detection; Exciton--exciton interaction; Higher-order signals; monolayer TMDCs