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Q: Fachverband Quantenoptik und Photonik

Q 30: QuanTour III – Spin Physics & Coherence

Q 30.4: Vortrag

Mittwoch, 4. März 2026, 15:30–15:45, P 1

Temporal coherence of interlayer excitons in TMDC heterobilayers — •Ibrahim sarpkaya — Bilkent University - UNAM, Ankara 06800, Turkey

Semiconducting transition metal dichalcogenides (TMDCs) and their van der Waals heterostructures have been extensively studied during the last decade. Due to their long spontaneous emission lifetime, permanent electric dipole moment, and tunable light emission characteristics, interlayer excitons (IXs) of TMDC heterobilayers have great potential to be the primary candidates for the advancement of valleytronic and optoelectronic devices in the future. However, some open questions related to their temporal coherence and the nature of the interaction between the two spin states of them still need to be answered. In this talk, I will first talk about our recent work focusing on the effect of moiré potentials on the temporal coherence properties of IXs [1]. Then, I will discuss the coherent coupling between two spin states of the IXs and demonstrate the quantum beat pattern as a signature of this coupling [2].

[1] Durmuş et al. npj 2D Mater Appl 7 (2023).

[2] Durmuş, M. A. & Sarpkaya, I. Nano Lett. 24 (2024).