Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 29: Poster II
HL 29.96: Poster
Dienstag, 18. März 2025, 18:00–20:00, P1
Investigation of dynamics and character of excitons in WSe2 multilayers — •Anna Weindl1, Matthias Brem1, Jennifer Lehner1, Kenji Watanabe2, Takashi Taniguchi3, and Christian Schüller1 — 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg, 93053 Regensburg — 2Research Center for Functional Materials, National Institute for Materials Science, Tsukuba Ibaraki 305-0044, Japan — 3International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba Ibaraki 305-0044, Japan
We report about our time-resolved Faraday ellipticity (TRFE) experiments on multilayers of the transition metal dichalcogenide WSe2. In a continuation of our recent work by Raiber et al. [1], we aim to investigate the nature of the temporal dynamics in WSe2 multilayers. These previous results have shown that pseudospin oscillations appear in the TRFE signal when we apply an in-plane magnetic field to our multilayer samples. Current results show that the oscillations have two different frequencies, a shorter one earlier in time and a longer one later in time. In differential transmission measurements, the lifetimes show a fast and slow decay on the same time scales. This suggests two different exciton dynamics or species. Now we try to characterize and manipulate these oscillations by playing with different experimental parameters. Varying the angle of the magnetic field, adding an electric field or investigating the layer dependence are examples for our toolbox of parameters to gain further insights in the dynamics of the multilayers. [1] Raiber et al., Nat Commun 13, 4997 (2022).
Keywords: TRFE; Multilayer; Time-resolved; Oscillation; inplane magnetic field