Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 13: 2D Materials III – Interlayer excitons
HL 13.7: Vortrag
Montag, 9. März 2026, 18:15–18:30, POT/0081
Interplay of excitonic species in vertical and lateral transition metal dichalcogenide heterostructures — •Sai Shradha1, Md. Tarik Hossain2, Nicole Engel1, Luc Oswald1, Julian Führer1, Daria Markina1, Andrey Turchanin2, and Bernhard Urbaszek1 — 1Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstraße 6-8, D-64289 Darmstadt, Germany — 2Institute of Physical Chemistry, Friedrich Schiller University Jena, Lessingstr. 10, D-07743 Jena, Germany
The properties of transition metal dichalcogenides (TMDs) can be extended beyond those offered by individual monolayers by combining different monolayers to create heterostructures. Vertically stacked heterostructures host quasi-particles such as interlayer and Moiré excitons. In lateral heterostructures (LHs), where monolayers of different materials are covalently bonded in the plane of their atoms, unidirectional exciton transport and the formation of charge-transfer excitons can be realized [1]. Chemical vapour deposition (CVD) has been a key fabrication technique for LHs. This work investigates composite CVD-grown MoSe2-WSe2 heterostructures consisting of both lateral and vertical interfaces, providing a single platform to study exciton dynamics across different interface types. Optical spectroscopy reveals efficient interlayer coupling in such structures, resulting in a uniquely strong interlayer exciton emission. Several spectroscopy techniques, including magneto-optics, are employed to characterize and shed light on exciton dynamics in such systems.
[1] S. Shradha et. al., arXiv, 2510.21422 (2025)
Keywords: 2D - Materials; Transition Metal Dichalcogenides; Excitons; Heterostructures