Large-scale quantum-emitter arrays in atomically thin semiconductors.

Area of Science:

• Materials Science
• Quantum Optics
• Condensed Matter Physics

Background:

• Quantum light emitters in transition metal dichalcogenides (TMDs) are crucial for quantum technologies.
• Their random locations and low densities in TMD monolayers hinder experimental investigation and device integration.

Purpose of the Study:

• To develop a deterministic method for creating arrays of quantum emitters in TMD monolayers.
• To achieve greater spectral stability and control over emitter positioning.

Main Methods:

• Monolayers of tungsten diselenide and tungsten disulphide were deposited onto silica substrates.
• Substrates were nanopatterned with arrays of silica pillars (150-nm diameter, 60-190 nm height).
• Nanopillars induced localized deformations, leading to quantum confinement of excitons and emitter formation.

Main Results:

• Deterministic arrays of hundreds of quantum emitters were successfully created.
• Emitters covered visible spectrum wavelengths (610-680 nm and 740-820 nm).
• The engineered emitters exhibited enhanced spectral stability compared to random emitters.

Conclusions:

• The nanopillar fabrication method enables scalable, deterministic placement of quantum emitters in TMD monolayers.
• This approach facilitates integration into photonic structures like optical waveguides.
• Precise positioning of quantum emitters is now achievable for advanced quantum device applications.