Dresden 2026 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: 2D Materials III – Interlayer excitons

HL 13.2: Talk

Monday, March 9, 2026, 17:00–17:15, POT/0081

Ring-shaped Interlayer Exciton Ensembles in MoSe₂/WSe₂ Heterostructures by Laguerre-Gaussian Excitation — •Mirco Troue¹, Johannes Figueiredo¹, Gabriel Mittermair¹, Jonas Kiemle¹, Hendrik Lambers², Ana Senkić², Ursula Wurstbauer², and Alexander Holleitner¹ — ¹Walter Schottky Institute and Physics Department, TU Munich, Am Coulombwall 4a, 85748 Garching, Germany — ²Institute of Physics, Münster University, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany

Transition metal dichalcogenide monolayers exhibit strong light-matter interactions, which promotes them as ideal candidates for novel 2D optoelectronic applications. A vertical stacking into van der Waals heterostacks leads to the formation of long-lived interlayer excitons in adjacent layers. We report on ring-shaped ensembles of interlayer excitons in MoSe₂/WSe₂ heterostructures as excited by an optical Laguerre-Gaussian mode. The excitation is achieved with the help of a spatial light modulator. A hyperspectral analysis of the exciton photoluminescence suggests that the excitation scheme generates a non-uniform momentum distribution that favors the accumulation of high-energy excitons in the rings’ center. We discuss the mechanisms leading to such a distribution, including exciton-exciton interaction, phase-space filling, and incomplete thermalization.

Keywords: interlayer excitons; exciton trap; two-dimensional materials; spatial light modulator