Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 16: Poster Monday: Ultrafast Processes 1
O 16.9: Poster
Montag, 5. September 2022, 18:00–20:00, P4
Type II aligned TMD heterostructures: Probing moiré interlayer excitons with energy-, momentum-, and femtosecond time-resolution — •Marcel Reutzel1, David Schmitt1, Jan Philipp Bange1, Wiebke Bennecke1, AbdulAziz AlMutairi2, Giuseppe Meneghini3, Daniel Steil1, R. Thomas Weitz1, Sabine Steil1, G. S. Matthijs Jansen1, Samuel Brem3, Ermin Malic3, Stephan Hofmann2, and Stefan Mathias1 — 1I. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany — 2Department of Engineering, University of Cambridge, Cambridge CB3 0FA, U.K. — 3Fachbereich Physik, Philipps-Universität, 35032 Marburg, Germany
Transition metal dichalcogenides (TMDs) can be stacked into atomically thin p-n junctions, where an optically excited intralayer exciton can decay into interlayer excitons. Here, the electron and the hole contribution to the quasiparticle reside in the neighbouring TMD layers.
On this poster, we show our recent progress towards the identification and characterization of the ultrafast charge transfer process across a type II interface. Using femtosecond momentum microscopy, we identify the distinct momentum fingerprints of various excitonic states in this system, notably the bright and dark intralayer excitons as well as the interlayer exciton. Most intriguingly, the momentum-resolved measurement provides quantitative access to the interlayer exciton wavefunction that is modulated within the moiré potential.
Schmitt et al., *arXiv:2112.05011 (2021).