Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.13: Poster

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

Electrical control of orbital and vibrational interlayer coupling in bi- and trilayer 2H-MoS₂. — Julian Klein^1,2, Jakob Wierzbowski¹, •Pedro Soubelet¹, Thomas Brumme^3,4, Lorenzo Maschio⁵, Agnieszka Kuc^6,7, Kai Müller¹, Andreas V. Stier¹, and Jonathan J. Finley¹ — ¹Walter Schottky Institut, TU München, Germany — ²Department of Materials Science and Engineering, MIT, USA. — ³Wilhelm-Ostwald-Institute for Physical and Theoretical Chemistry, Leipzig University, Germany. — ⁴Faculty for Chemistry and Food Chemistry, TU Dresden, Germany. — ⁵Dipartimento di Chimica and Centre of Excellence NIS, Università di Torino, Italy. — ⁶Helmholtz-Zentrum Dresden-Rossendorf, Abteilung Ressourcenökologie, Forschungsstelle Leipzig, Germany — ⁷Department of Physics and Earth Sciences, Jacobs University Bremen, Germany.

Manipulating electronic interlayer coupling in layered vdW materials is essential for designing optoelectronic devices. Here, we control vibrational and electronic interlayer coupling in bi- and trilayer 2H-MoS₂ using large external electric fields in a microcapacitor device. The electric field lifts Raman selection rules and activates phonon modes in excellent agreement with ab initio calculations. Through polarizationresolved photoluminescence spectroscopy, we observe a strongly tunable valley dichroism. By modeling our result using rate equations, we have explained the valley dichroism tunability using realistic material parameters.