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HL: Fachverband Halbleiterphysik
HL 25: Poster 1
HL 25.12: Poster
Wednesday, September 7, 2022, 18:00–20:00, P2
Valley dynamics in WSe2 monolayers and MoSe2-WSe2 heterobilayers — •Philipp Parzefall, Matthias Brem, and Christian Schüller — Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Deutschland
We have performed an in depth study of the valley coherence and polarization in hBN-encapsulated WSe2 monolayers, which shall be extended to WSe2-MoSe2 heterostructures.
Therefore, we investigate first the excitonic properties and possible exciton-phonon coupling in hBN-encapsulated WSe2 monolayers via micro-photoluminescence and resonant Raman spectroscopy measurements with excitation energies close to the A-exciton’s fine-structure. Hereby, the valley polarization and -coherence are of special interest as possible resonant phonon excitation influences the valley dynamics behavior tremendously.
Afterwards, the resulting understanding is used to investigate interlayer excitons and trions on MoSe2-WSe2 heterobilayers with 0∘ or 60∘ relative twist between the layers, similarly, with an excitation energy close to the resonances of the WSe2’s A-exciton.