Nanoparticle Stressor-Induced Single-photon Sources in Monolayer WS${}_2$ Emitting into a Narrowband Visible Spectral Range

Abstract

A van der Waals heterostructure containing an atomically thin monolayer transition-metal dichalcogenide as a single-photon emitting layer is emerging as an intriguing solid-state quantum-photonic platform. Here, we report the utilization of spin-coating of silica nanoparticles for deterministically creating the spectrally isolated, energetically stable, and narrow-linewidth single-photon emitters in ML-WS${}_2$. We also demonstrate that long-duration low-temperature annealing of the photonic heterostructure in the vacuum removes the energetically unstable emitters that are present due to fabrication-associated residue and lead to the emission of single-photons in a <25 nm narrowband visible spectral range centered at $\sim$620 nm. This work may pave the way toward realizing a hybrid-quantum-photonic platform containing a van der Waals heterostructure/device and an atomic-vapor system emitting/absorbing in the same visible spectral range.

5 figures

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• Van der Waals heterostructures
• Photonic quantum technologies
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Cited by in corpus (4)

• Quantum light generation with ultra-high spatial resolution in 2D semiconductors via ultra-low energy electron irradiation
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• Layered semiconductors integrated with polyimide thin films for high-quality valleytronic and quantum-photonic systems
• Measurements of absolute bandgap deformation-potentials of optically-bright bilayer WSe${}_2$