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HL: Fachverband Halbleiterphysik
HL 20: Poster I
HL 20.6: Poster
Dienstag, 10. März 2026, 18:00–20:00, P1
Optical Properties of Interlayer Excitons in Transition Metal Dichalcogenide Heterostructures — •Luc Frederik Oswald1, Sai Shradha1, Nicole Engel1, Julian Führer1, Md. Tarik Hossain2, Lukas Krelle1, Daria Markina1, Andrey Turchanin2, and Bernhard Urbaszek1 — 1Institute for Condensed Matter Physics, TU Darmstadt, Darmstadt, Germany — 2Institute for Physical Chemistry, Friedrich Schiller University, Jena, Germany
Interlayer excitons (IXs) in van der Waals heterostructures arise from electrons and holes confined in different monolayers, forming long-lived quasi particles with strong spin-valley coupling. In MoSe2/WSe2 systems, type-II band alignment and conduction-band splitting give rise to multiple IX states whose optical signatures are highly sensitive to temperature, lattice vibrations, and magnetic fields. This work investigates the optical response of an hBN-encapsulated, MoSe2/WSe2 lateral-vertical heterostructure grown via chemical vapour deposition (CVD). A combination of temperature-dependent photoluminescence, excitation-spectroscopy approaches, and magneto-optical measurements is used to probe the formation, evolution, and valley properties of interlayer excitons in this hybrid geometry. Together, they reveal characteristic interlayer emission features, their excitation pathways, and signatures of spin-layer hybridization.
Keywords: Van der Waals Heterostructures; Transition Metal Dichalcogenides; Excitons; 2D Materials; Magneto-Optics