Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 11: QuanTour I – Single Photons & Foundations

Q 11.5: Vortrag

Montag, 2. März 2026, 18:15–18:30, P 7

Enhanced Exciton Dynamics in Free-Standing TMD Heterobilayers — •Marah Alqedra and Ibrahim Sarpkaya — National Nanotechnology Research Center, Bilkent University, Ankara, Turkey

Atomically thin transition-metal dichalcogenide (TMD) van der Waals heterobilayers enable the formation of spatially indirect interlayer excitons (IXs), with electrons and holes residing in different layers, offering long exciton lifetimes and a permanent electric dipole, promising for valley/spin physics and quantum-optical applications. Substrate-supported heterostructures, however, often experience substrate-induced disorder and environmental coupling that degrade IX photoluminescence (PL) emission and reduce optical quality. To overcome these limitations, we prepared suspended heterobilayers free from substrate interaction. Low-temperature PL and time-resolved PL measurements show a strong enhancement of IX emission in suspended heterobilayers compared to conventional supported samples. This indicates suppression of non-radiative losses and environmental dephasing, improving excitonic optical performance, a step toward realizing high-quality 2D-material emitters and quantum-optical devices.

Keywords: 2D semiconductors; Free-standing TMD heterostructures fabrication; Low-temperature interlayer exciton dynamics; interlayer exciton photoluminescence enhancement; Non-radiative decay suppression