Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.15: Poster

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

Fabrication and Characterization of Twisted TMDC Bilayer — •Laura Nicolette Schusser, Sina Bahmanyar, Nihit Saigal, Hendrik Lambers, Hossein Ostovar, and Ursula Wurstbauer — Institute of Physics, University of Münster, Münster, Germany

Semiconducting 2D materials such as transition metal dichalcogenides (SC-TMDCs) excel due to their strong exciton dominated light matter interaction [1]. Van der Waals (VdW) heterobilayers prepared from SC-TMDCs are ideal systems for the realization and study of dense exciton ensmebles [2,3] and correlated phases phases of matter [4]. We are working to improve the fabrication protocol for high-quality twisted TMDC bilayers. We obtain monolayers by micro-mechanical exfoliation along with a deterministic pick-up and dry transfer using a viscoelastic stamp and to create vdW heterostacks with several layers. The twist angle between the layers is precisely controlled by a using a rotation stage. We use hexagonal boron nitride (hBN) as an encapsulating material. Photoluminescence (PL) spectroscopy combined with Raman spectroscopy is utilized for characterization. While the former technique probes the intralayer and interlayer exciton transitions, the latter one is used for the investigation of the phonon fingerprints of the system. [1] [1] U. Wurstbauer et al. J. Phys. D: Appl. Phys. 50, 173001 (2017). [2] L. Sigl et al. Physical Review Research 2, 042044(R) (2020). [3] J. Kiemle et al. Phys. Rev. B 101, 121404(R) (2020). [4] Y. Tang et al., Nature 579, 353 (2020).