Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.3: Poster

Wednesday, September 7, 2022, 18:00–20:00, P2

Surface acoustic wave modulation of optical and electrical properties in TMDC monolayers — •Clemens Strobl, Benjamin Mayer, Hendrik Lambers, Ursula Wurstbauer, and Hubert Krenner — Institute of Physics, University of Münster, Germany

Two-dimensional transition metal dichalcogenides (TMDCs) such as WSe2 exhibit large exciton binding energies combined with a high sensitivity of their bandgap energy to mechanical stimuli [1]. Excitons in these materials can be generated either optically by above band-gap illumination or via two electrodes. Similarly, excitons in TMDCs can be studied optically via photoluminescence and absorption spectroscopy, electrically by detecting a photocurrent or via the interaction with surface acoustic waves (SAWs).

The aim of this project is to investigate SAW-dependent photoconductance in exfoliated monolayers [2] and to determine the influence of SAWs on the optical and optoelectronic properties in TMDCs. We study the SAW-driven exciton transport in monolayers and thus the change in the exciton decay rate [1]. For all experiments lithium niobite (LiNbO3) substrates and interdigitated electrodes (IDTs) operating at a frequency range from 300MHz up to 1GHz are used.

[1] Datta et al. Nat. Photon. 16, 242-247 (2022). [2] Preciado, E., Schülein, F., Nguyen, A. et al. Nat Commun 6, 8593 (2015).