Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.25: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Optical excitations in 2D material heterostructures under pressure — •Devika Sivankutty, Paul Steeger, Johann Preuß, Robert Schmidt, Steffen Michaelis de Vasconcellos, and Rudolf Bratschitsch — University of Münster, Institute of Physics and Center for Nanotechnology, Wilhelm-Klemm Str. 10, 48149 Münster

Heterostructures of transition metal dichalcogenides (TMDCs) have attracted a lot of attention due to their unique optical and electronic properties and easy fabrication by stacking distinct TMDC monolayers on top of each other. Depending on the material choice, the heterostructures can also exhibit interlayer excitons, where the hole resides in one layer and the electron in the other. The coupling between the layers, and thereby the optical and electronic properties of the heterostructure, are expected to be strongly dependent on the interlayer distance, which can be tuned by applying pressure to the heterostructure. Here, we investigate the optical properties of TMDC heterostructures under high pressure in a diamond anvil cell. We use a home-built stamping setup to fabricate the heterostructures and perform optical spectroscopy at various pressure values to investigate the excitonic resonances.

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