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We acknowledge support from the German Research Foundation (DFG) via Grants RE2974/12-1, RE2974/26-1 and from the project EMPIR JRP 17FUN06 SIQUST (the EMPIR initiative is co-funded by the European Union's Horizon 2020 research and innovation program and the EMPIR Participating States). We acknowledge also financial support within the QuantERA II Programme that has received funding from the European Union's Horizon 2020 research and innovation programme under Grant Agreement No 101017733, and from the German Ministry of Education and Research (BMBF) via the projects EQUAISE and TubLan Q.0. The authors are thankful for technical support by the group of Tobias Heindel. We further thank Professor D S Kim (UNIST, Ulsan, Republic of Korea) and Dr L N Tripathi (Vellore Institute of Technology, Tamil Nadu, India) for preparing and providing the substrate.

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Temperature dependent temporal coherence of metallic-nanoparticle-induced single-photon emitters in a WSe2 monolayer

Publicated to:2D Materials. 10 (4): - 2023-10-01 10(4), DOI: 10.1088/2053-1583/acfb20

Authors: von Helversen, M.; Greten, L.; Limame, I.; Shih, C.W.; Schlaugat, P.; Antón-Solanas, C.; Schneider, C.; Rosa, B.; Knorr, A.; Reitzenstein, S.

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Abstract

In recent years, much research has been undertaken to investigate the suitability of two-dimensional materials to act as single-photon sources with high optical and quantum optical quality. Amongst them, transition-metal dichalcogenides, especially WSe2, have been one of the subjects of intensive studies. Yet, their single-photon purity and photon indistinguishability remain the most significant challenges to compete with mature semiconducting systems such as self-assembled InGaAs quantum dots. In this work, we explore the emission properties of quantum emitters in a WSe2 monolayer which are induced by metallic nanoparticles. Under quasi-resonant pulsed excitation, we verify clean single-photon emission with a g((2))(0) = 0.036 +/- 0.004. Furthermore, we determine the temperature dependent coherence time via Michelson interferometry, where a value of (13.5 +/- 1.0) ps is extracted for the zero-phonon line at 4 K, which reduces to (9 +/- 2) ps at 8 K. Associated time-resolved photoluminescence experiments reveal a decrease of the decay time from (2.4 +/- 0.1) ns to (0.42 +/- 0.05) ns. This change in decay time is explained by a model which considers a F & ouml;rster-type resonant energy transfer process which yields a strong temperature induced energy loss from the single-photon emitters to the nearby Ag nanoparticle.

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