Dresden 2026 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 3: 2D Materials I – Excitonic properties

HL 3.11: Talk

Monday, March 9, 2026, 12:15–12:30, POT/0081

Acousto-optic characterization of van der Waals systems — •Felix Ehring, Benjamin Mayer, Hubert Krenner, Ursula Wurstbauer, and Emeline Nysten — Institute of Physics, University of Münster, Germany

With wavelengths in the micrometer range at GHz frequencies, surface acoustic waves (SAWs) are a versatile tool for radio frequency control and probing of charge carrier dynamics in novel semiconductor nanostructures. They are generated on a piezoelectric chip and routed over long distances to couple either mechanically or electrically to many solid-state nanosystems [1]. In our experiments, we fabricated hybrid lithium niobate SAW-devices in which different mechanically exfoliated transition metal dichalcogenide (TMDC) 2D materials were transferred. We investigated the influence of SAW-induced dynamic electric and strain fields on the photoluminescence (PL) of various TMDCs and their heterostructures. By combining optical and acoustic measurements, we were able to gain insights on the charge carrier dynamics and their resulting impact on exciton recombination and lifetime [2].

[1] Per Delsing et al 2019, J. Phys. D: Appl. Phys. 52 353001 [2] Emeline Nysten et al 2024, Adv Mater 36 e2402799

Keywords: surface acoustic waves; TMDC heterostructures; excitons