Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.14: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Assigning excitonic transitions in reconstructed MoSe2-WSe2 heterostacks — •Christos Paspalides1, Mirco Troue1, Lukas Sigl1, Johannes Figueiredo1, Manuel Katzer2, Malte Selig2, Florian Sigger1, Roland Gillen3, Jonas Kiemle1, Andreas Knorr2, Ursula Wurstbauer4, and Alexander Holleitner11TU Munich — 2Technische Universität Berlin — 3Friedrich-Alexander-Universität Erlangen-Nürnberg — 4University of Münster

Transition metal dichalcogenide monolayers exhibit strong light-matter interactions, which promotes them as ideal candidates for novel 2D optoelectronic applications. The vertically stacked Van der Waals heterostacks facilitate the emergence of a type-II band alignment, which leads to the formation of long-lived interlayer excitons. We present g-factors for three distinct interlayer exciton emissions in MoSe2-WSe2 heterostacks measured up to 9 T. Theoretical considerations including density functional theory lead to the assignment of the characteristic emission lines to optical transitions inside an atomically reconstructed H-type heterostack with a near-zero twist-angle. Here, the Hhh atomic registry is able to fill sizable commensurate domains within the reconstructed lattice while the corresponding selection rules are found to govern the optical response of the system.

Following the attribution of the interlayer exciton emissions, we provide a deeper insight into the effect of atomic reconstruction in MoSe2-WSe2 heterostacks and discuss the possibility for a macroscopic occupation of the ground-state leading to unique many-body effects of interlayer excitons in such systems.

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