SKM 2021 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 25: 2D semiconductors and van der Waals heterostructures II (joint session HL/DS)
HL 25.2: Vortrag
Freitag, 1. Oktober 2021, 13:45–14:00, H4
Moiré phonons in twisted MoSe2-WSe2 heterobilayers and their correlation with interlayer excitons — •Philipp Parzefall1, Johannes Holler1, Marten Scheuck1, Andreas Beer1, Kai-Qiang Lin1, Bo Peng2, Bartomeu Monserrat2,3, Philipp Nagler1, Michael Kempf4, Tobias Korn4, and Christian Schüller1 — 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Deutschland — 2Theory of Condensed Matter Group, Cavendish Laboratory, University of Cambridge, UK — 3Department of Materials Science and Metallurgy, University of Cambridge, UK — 4Institut für Physik, Universität Rostock, Deutschland
We report about the investigation of twisted MoSe2-WSe2 heterobilayers by means of low-frequency Raman spectroscopy (LFRS) and low-temperature micro photoluminescence (µPL). We identify moiré phonons of both constituting materials in heterobilayers, which enables us to determine the relative twist angles of the heterobilayers on a local scale with high precision. Atomically reconstructed regions, which are identified by the observation of an interlayer shear mode in LFRS experiments, exhibit in µPL a strong, momentum-allowed interlayer-exciton signal.