Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 53: 2D Materials II: Transition Metal Dichalcogenides
O 53.5: Vortrag
Mittwoch, 3. April 2019, 11:30–11:45, H16
Exciton propagation in TMDC monolayers at room temperature — •Marvin Kulig1, Jonas Zipfel1, Philipp Nagler1, Sofia Blanter1, Jonas Ziegler1, Christian Schüller1, Tobias Korn1, Nicola Paradiso1, Misha Glazov2, and Alexey Chernikov1 — 1Department of Physics, University of Regensburg — 2Ioffe Institute, Saint Petersburg, Russian Federation
In our work, we examine two dimensional exciton transport of several TMDC materials by directly monitoring the excitonic emission of the optically excited system through spatially- and time-resolved photoluminescence. In order to suppress effects from the silicon oxide substrate roughness, we additionally produce samples encapsulated between thin layers of hexagonal boron nitride. Depending on the injected exciton density, we observe highly nonlinear behavior with characteristic, qualitative changes in the spatial profiles, which results in an increase of the measured effective diffusion coefficient of up to two orders of magnitude. Solving the diffusion equation in consideration of Auger recombination provides the main interpretation and a physical basis of the observed phenomena. For the encapsulated monolayers, Auger recombination is highly suppressed, while the linear diffusion coefficient is more than one order of magnitude larger than for the as-exfoliated, non-encapsulated monolayers.