Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 29: Poster II

HL 29.14: Poster

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

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 with almost any nanosystem [1]. In our experiments, we fabricated hybrid lithium niobate SAW-devices including SAW delay lines with design frequencies of 150-250MHz, on which different mechanically exfoliated transition metal dichalcogenide (TMDC) 2D materials can be placed. The dynamic strain and electric field of the SAW induce a band modulation in the TMDC structure. The focus of the experiments was the investigation of MoSe2-WSe2 heterostructures and their interlayer excitons. For the characterization, the influence of the SAW fields on the recombination time and energy was investigated. Since interlayer excitons provide a much longer lifetime than intralayer excitons, transport along the propagation direction of the wave should be possible and will be part of future experiments. [1] J. Phys. D:Appl. Phys. 52(35):353001 (2019)

Keywords: surface acoustic waves; TMDC heterostructures; excitons