Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 29: Poster II
HL 29.22: Poster
Dienstag, 18. März 2025, 18:00–20:00, P1
Having a Good Vibe: Electron-Phonon Coupling in 1L-TMDCs Measured by Transient Absorption Spectroscopy — Tim Völzer1,2, •Julian Schröer1,2, Marvin Krupp1,2, Annika Bergmann1,2, Tobias Korn1,2, and Stefan Lochbrunner1,2 — 1University of Rostock, Institute of Physics — 2Department "Life, Light & Matter, University of Rostock
The optoelectronic properties of monolayer transition metal dichalcogenides (1L-TMDCs) are strongly determined by their electronic dynamics after light excitation. In this work, we present insights on the ultrafast dynamics of three different 1L-TMDCs by employing transient absorption (TA) spectroscopy. Our findings show that the basic processes after optical excitation can be divided into cooling of the electronic and phononic system and the subsequent recombination of the excited species. We reveal the importance of the differing coupling strengths to high- versus low-energy phonons. Due to the ultrashort pump pulse excitation, we are also able to trigger the displacive excitation of coherent phonons, which we assign to the A’1 Raman mode of the system. Our results demonstrate the strong coupling between the electronic and phononic systems and lead to better understanding of excited state carrier dynamics in 1L-TMDC materials.
Keywords: Electron-Phonon Coupling; TMDC; Monolayer; 2D Materials; Optical Spectroscopy