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THU: Thursday Contributed Sessions

THU 13: Poster Session: Applications

THU 13.93: Poster

Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG

Hyperspectral Imaging and Optical Characterisation of Localized and Delocalized Exciton Complexes in Transition Metal Dichalcogenides — •Shachi Machchhar, Bhabani Sankar Sahoo, Yuhui Yang, Imad Limame, Johannes Schall, Sven Rodt, Chirag Chandrakant Palekar, and Stephan Reitzenstein — 1Institut für Physik und Astronomie, Technische Universität Berlin, Berlin, Germany

The development of on-demand sources of single photons with high indistinguishability represents a crucial step in the creation of photonic quantum systems, such as those required for the construction of large-scale quantum networks for the secure transfer of data. One potential avenue for the realization of such sources in a scalable and cost-effective manner is the exploitation of defect centres in transition metal dichalcogenides (TMDCs). The fabrication of these defect centres in TMDC monolayers (MLs) can be achieved through the introduction of strain, ion implantation, and the structuring or patterning of the substrate. In this study, we pattern hBN with the help of electron beam lithography and deposit a WSe2 ML on the top to induce strain, which facilitates the generation of single-photon sources with distinct quantum optical properties. We then perform hyperspectral cathodoluminescence imaging on the fabricated structure to determine the localised and delocalised excitonic states in the ML. We optically characterise the said states and furthermore, demonstrate the single-photon nature of these single-photon emitters through second-order correlation measurements.

Keywords: Transition Metal Dichalcogenides; Cathodoluminescence; WSe2; Single-photon Emitters; electron beam lithography