Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.4: Poster

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

Raman fingerprint of twisted TMDC bilayers — Sina Bahmanyar, Nihit Saigal, •Hossein Ostovar, and Ursula Wurstbauer — Institute of Physics, University of Münster, Münster, Germany

The discovery of superconductivity and other correlated phases in twisted bilayer graphene opened up a new field of research aimed at understanding the many body physics and strong electronic interactions in twisted van der Waals bilayers. [1] Such bilayer systems provide an ideal platform for simulation of Hubbard model physics and its control using the relative twist angle between the layers [2] in order to tune interlayer interaction and electronic correlations. [1,2] We have fabricated twisted WSe2 bilayers with various twist angles between the monolayers and characterized them using low and high energy Raman spectroscopy and photoluminescence spectroscopy. The low-frequency Raman spectra shows the shear modes that are highly sensitive to the twist angle and interlayer coupling between the monolayers. Our measurements establish Raman spectroscopy as a non-destructive way to characterize the interlayer coupling in twisted TMDC bilayers to study electronic and excitonic correlation physics [3]. We acknowledge financial support via WU 637/7-1 and SPP2244. [1] Y. Cao et al., Nature 556, 23 (2018). [2] Y. Tang et al., Nature 579, 353 (2020) [3] L. Sigl. et al. Phys. Rev. Res. 2, 042044(R) (2020)