Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 98: Ultrafast electron dynamics at surface and interfaces IV
O 98.10: Talk
Friday, March 13, 2026, 12:00–12:15, TRE/MATH
Formation and thermalization of non-equilibrium excitonic occupations — •Paul Werner1, Wiebke Bennecke1, Jan Philipp Bange1, Giuseppe Meneghini2, David Schmitt1, Marco Merboldt1, Anna Seiler1, AbdulAziz AlMutairi3, G. S. Matthijs Jansen1, Junde Liu1, Daniel Steil1, Stephan Hofmann3, R. Thomas Weitz1, Ermin Malic2, Stefan Mathias1, and Marcel Reutzel3 — 1I. Physikalisches Institut, Georg-August Universität Göttingen, Germany — 2Fachbereich Physik, Philipps-Universität Marburg, Germany — 3Department of Engineering, University of Cambridge, United Kingdom
Upon optical excitation, bright excitons can scatter into lower energy, potentially dark, exciton states. In these formation and relaxation processes, non-equillibrium exciton populations play a major role, but remain largely elusive because they are inaccessible by most spectroscopic methods. In this work we provide direct access to the formation and thermalization of non-equilibrium exciton states in 2H-homobilayer MoS2. Using time-resolved momentum microscopy and microscopic many-particle calculations, we reveal the fingerprint of non-equillibrium exciton distributions and quantify their formation and relaxation timescale [1].
[1] Werner et al., arXiv:2505.06074 (2025).
Keywords: momentum microscopy; exciton; ultrafast dynamics; transition-metal dichalcogenides