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O: Fachverband Oberflächenphysik
O 47: Poster Session - 2D Materials: Electronic Structure, Excitations, etc.
O 47.1: Poster
Dienstag, 17. März 2020, 18:15–20:00, P2/EG
Time-resolved and spatially resolved exciton dynamics in a microstructured WSe2 monolayer investigated by 2D nanoscopy — •Daniel Fersch1, Sebastian Pres1, Victor Lisinetskii1, Robert Schneider2, Johannes Kern2, Matthias Hensen1, Rudolf Bratschitsch2, and Tobias Brixner1 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Institute of Physics and Center for Nanotechnology, University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany
Atomically flat layers of transition metal dichalcogenides, e.g., WSe2, are a fascinating material class with potential optoelectronic applications due to their direct bandgap and large exciton binding energies. Mechanical strain on the monolayer can lead to the formation of localized single-photon sources, which are of large interest for quantum-optical applications [1].
As these single-photon emitters are highly localized, it is beneficial to bypass the optical diffraction limit to investigate their physical nature. In this work, we therefore want to employ two-color time-resolved photoemission electron microscopy (TR-PEEM) on a WSe2 monolayer to inspect local differences in the excited-state dynamics. Furthermore, we plan to use 2D nanoscopy [2,3] to directly probe the electronic structure of the material on a nanometer scale.
[1] J. Kern et al., Adv. Mater. 2016, 28, 7101.
[2] M. Aeschlimann et al., Science 2011, 333, 1724.
[3] B. Huber, S. Pres et al., Rev. Sci. Instr. 2019, 90, 113103.