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HL: Fachverband Halbleiterphysik

HL 62: 2D Semiconductors and van der Waals Heterostructures VII

HL 62.2: Vortrag

Freitag, 21. März 2025, 12:00–12:15, H15

Deterministic generation of single-photon emitters in 2D materials by in-situ electron beam lithography — •Shachi Machchhar, Bhabani Sankar Sahoo, Yuhui Yang, Imad Limame, Chirag Chandrakant Palekar, and Stephan Reitzenstein — 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 can be achieved through the introduction of strain, ion implantation, and the structuring or patterning of the substrate. In this study, we employ cathodoluminescence (CL) spectroscopy at cryogenic temperatures to probe hBN-encapsulated WSe* and utilise in-situ electron beam lithography (iEBL) to structure pre-determined patterns on the emission active region. This nanopatterning of the monolayer facilitates the deterministic generation of single-photon emitters (SPEs) with distinct quantum optical properties. Furthermore, we demonstrate the single-photon nature of these SPEs through second-order correlation measurements on the MLs. Additionally, we study the temperature dependence of such SPEs generated in various patterned geometries.

Keywords: single-photon emitters; transition metal dichalcogenides; cathodoluminescence; WSe2