Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 48: 2D Materials 1: Electronic Structure of Transition Metal Dichalcogenides
O 48.9: Talk
Wednesday, September 7, 2022, 17:00–17:15, S052
Time-resolved momentum microscopy of moiré interlayer excitons in twisted TMD heterostructures — •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, Marcel Reutzel1, and Stefan Mathias1 — 1I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, Göttingen, Germany — 2Department of Engineering, University of Cambridge, Cambridge CB3 0FA, U.K. — 3Fachbereich Physik, Philipps-Universität, 35032 Marburg, Germany
Transition metal dichalcogenides (TMDs) are extensively studied because of their exceptional material properties. The stacking of different TMDs can lead to even more intriguing electronic properties: In type-II band aligned TMD stacks, novel excitonic states can be created where the electron and the hole contribution to the exciton are separated between the van-der-Waals-coupled TMDs. A twist angle between these layers allows further manipulation of the electronic properties and gives rise to moiré-patterns which leads to distinct patterns in momentum space. Here, we make use of our setup for time-resolved momentum microscopy that is perfectly suited to probe these excitonic features with energy- and in-plane momentum resolution. We present femtosecond evaluation of the momentum-fingerprints of the excitonic features that are created on a type II aligned heterostructure. Schmitt et al., arXiv:2112.05011 (2021).