Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.13: Poster

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

Electrical control of orbital and vibrational interlayer coupling in bi- and trilayer 2H-MoS2.Julian Klein1,2, Jakob Wierzbowski1, •Pedro Soubelet1, Thomas Brumme3,4, Lorenzo Maschio5, Agnieszka Kuc6,7, Kai Müller1, Andreas V. Stier1, and Jonathan J. Finley11Walter 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.

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