Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 29: Poster II

HL 29.92: Poster

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

Two-dimensional spectroscopy setup for the investigation of excitons and polaritons in 2D materials — •Trideep Kawde, Pavel Trofimov, Matteo Russo, Anton Trenczek, David Koch, and Hélène Seiler — Freie Universität Berlin, 14195, Berlin, Germany

Coherent two-dimensional (2D) electronic spectroscopy is a powerful tool for probing interactions between electronically excited states and map their evolution in both energy and time domains. Here we introduce a coherent two-dimensional spectrometer tunable over the 460-950 nm spectral range to investigate the exciton and polariton dynamics in 2D materials. We employ a hollow-core fiber setup for broadband visible continuum generation. Pulse shapers are used to produce phase-locked sequences of pulses. A custom sample area has been designed specifically for 2D materials, typically featuring high degrees of spatial inhomogeneity and small sizes (few tens of micrometers). Linear spectroscopies can be performed at the same position as the 2D spectroscopy experiments, including angle-resolved spectroscopy to investigate polariton dispersion. With our setup we will be able to reveal insights into excitonic and polaritonic properties in 2D materials.

Keywords: 2D materials; 2D Spectroscopy; Ultrafast technique; Excitons