SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 8: 2D Materials II (joint session HL/CPP)

HL 8.9: Invited Talk

Monday, March 27, 2023, 17:30–18:00, POT 81

Time-resolved optical spectroscopy of 3R-stacked MoS₂ — •Swarup Deb, Michael Kempf, Rico Schwartz, and Tobias Korn — Institute of Physics, Rostock University

Manipulation of in-plane rotational and out-of-plane stacking symmetry in engineered two-dimensional (2D) crystals has provided means to realize a variety of exotic phases in extremely thin structures. The emergence of out-of-plane ferroelectricity in rhombohedrally-stacked 2D materials, such as boron nitride and transition metal dichalcogenides (TMDs), is a recent addition to this, but so far, most research on rhombohedrally stacked (3R) TMDs focussed on bilayer units.

Here, we present a systematic study of low-temperature absorption, differential reflectivity, and Kerr rotation in 3R-stacked MoS₂ as a function of thickness, aiming to probe the effects of ferroelectricity and interlayer charge transfer on ground-state exciton properties, valley and photocarrier dynamics. We observe clear signatures of an energetic splitting of the A exciton, as well as valley and energy relaxation dynamics on a few-ps timescale.