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DS: Fachverband Dünne Schichten
DS 21: Optical Analysis of Thin Films
DS 21.1: Vortrag
Freitag, 13. März 2026, 09:30–09:45, REC/C213
From Semiconductors to Quantum Materials: Ultrafast Optical Signatures Across Chalcogenide Classes — •Timo Veslin1, Felix Hoff1, Jonathan Frank1, and Matthias Wuttig1,2 — 1I. Institute of Physics (IA), RWTH Aachen University, Germany — 2Peter Grünberg Institute - JARA-Institute Energy Efficient Information Technology (PGI-10), Jülich, Germany
Optical pump probe spectroscopy provides a powerful means to investigate and compare ultrafast dynamics in diverse material classes, ranging from covalently bonded semiconductors to quantum materials. In this study, we contrast the optical and structural responses of sesquichalcogenides like In2Te3 films with those of quantum materials such as Bi2Te3 or Sb2Te3. Femtosecond pump probe and complementary spectroscopic analyses reveal that In2Te3 exhibits remarkably stable optical and vibrational properties across a wide thickness range, attributed to its predominantly covalent bonding network. In contrast, quantum materials based on Bi or Sb display pronounced thickness-dependent responses and strong coupling between coherent phonons and electronic states. These materials demonstrate tunable coherent lattice motions through variations in pump fluence, polarization, and pulse sequencing, offering routes for ultrafast manipulation of quantum states. The comparison highlights a clear distinction between structurally robust semiconducting chalcogenides and highly responsive quantum materials. Together, these findings delineate how bonding character and electronic topology govern ultrafast optical behavior.
Keywords: Pump Probe; Chalcogenides; Coherent Phonons; Femtosecond Laser; Quantum Materials