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TT: Fachverband Tiefe Temperaturen
TT 16: 2D Materials I: Electronic Structure (joint session O/TT)
TT 16.10: Talk
Monday, March 18, 2024, 17:15–17:30, MA 005
Ultrafast momentum microscopy of hybrid exciton dynamics in homobilayer 2H-MoS2 — •Paul Werner1, Jan Philipp Bange1, Wiebke Bennecke1, David Schmitt1, Giuseppe Meneghini2, Anna Seiler1, AbdulAziz AlMutairi3, Marco Merboldt1, Sabine Steil1, Daniel Steil1, Stephan Hofmann3, G. S. Matthijs Jansen1, Samuel Brem2, R. Thomas Weitz1, Ermin Malic2, Marcel Reutzel1, and Stefan Mathias1 — 1I. Physikalisches Institut, Georg-August Universität Göttingen, Germany — 2Fachbereich Physik, Philipps-Universität Marburg, Germany — 3Department of Engineering, University of Cambridge, United Kingdom
Transition-metal dichalcogenides (TMDs) monolayers host a rich landscape of excitonic states. If, in addition, these monolayers are stacked on top of each other, novel interlayer and hybrid excitonic states can form. Hybrid excitons, where either the excitons’ hole or electron is layer-delocalized as a result of interlayer hopping, are responsible for efficient charge transfer between the layers [1, 2]. In homobilayer MoS2, hybrid excitons are predicted to be the energetically most favorable excitonic state, making it an ideal system to study their properties. We employ time-resolved momentum microscopy to study the ultrafast exciton dynamics in H-stacked homobilayer MoS2. By directly imaging the electron and hole contributions of the hybrid excitons, we are able to track their ultrafast dynamics.
[1] Schmitt et al., Nature 608, 499-503 (2022)
[2] Bange, Werner et al., 2D Mater. 10 035039 (2023)
Keywords: excitons; transition-metal dichalcogenides; time-resolved momentum microscopy; ultrafast dynamics; 2D materials