Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 36: Poster III

HL 36.37: Poster

Wednesday, March 20, 2024, 18:00–20:30, Poster E

Optical spectroscopy of atomically thin MoS₂ under high pressure — •Paul Steeger, Jan-Hauke Graalmann, Robert Schmidt, Philipp Marauhn, Marie-Christin Heißenbüttel, Jan Nellesen, Ilya Kupenko, Carmen Sanchez-Valle, Steffen Michaelis de Vasconcellos, Miachel Rohlfing, and Rudolf Bratschitsch — University of Münster, Germany

High-pressure diamond anvil cells (DACs) are a recent addition to the toolkit for investigating two-dimensional materials and their heterostructures. They can exert compressive strain to samples, allowing precise manipulation of interlayer coupling strength in multi-layered van der Waals materials. Here, we present pressure-dependent optical transmission spectra of 2H-MoS₂ bilayers under pressure and extract the respective energy shift rates of inter- and intralayer excitons. Additionally, our findings highlight an interesting observation: the actual deformation of the sample differs from hydrostatic compression due to substrate effects. We discuss strategies to address this common challenge encountered in high-pressure experiments on 2D materials in conjunction with complementary DFT-based calculations. [1]

[1] P. Steeger, J.-H. Graalmann et al., Nano Lett., 23, (2023)

Keywords: MoS2 bilayer; interlayer exciton; high pressure; optical spectroscopy