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Deterministic strain-induced arrays of quantum emitters in a two-dimensional semiconductor
Artur Branny1, Santosh Kumar1, Raphaël Proux1
1Institute of Photonics and Quantum Sciences, SUPA, Heriot-Watt University, Edinburgh EH14 4AS, UK.
Nature Communications
|May 23, 2017
Summary
Researchers created a 2D lattice of quantum emitters in atomically thin semiconductors. This breakthrough uses nanoscale strain engineering for deterministic positioning, paving the way for scalable quantum photonics architectures.
Area of Science:
- Quantum photonics
- Materials science
- Nanotechnology
Background:
- Scalability in quantum photonics hinges on deterministic positioning of single quantum emitters.
- Existing platforms like diamond defects and quantum dots face challenges with coherence and optical quality.
- Layered transition metal dichalcogenide semiconductors present a promising avenue for scalable quantum architectures.
Purpose of the Study:
- To deterministically create a two-dimensional lattice of quantum emitters in atomically thin semiconductors.
- To leverage nanoscale strain engineering for precise emitter placement.
- To achieve high-purity single photon emission from engineered quantum emitters.
Main Methods:
- Utilizing nanoscale strain engineering to create point-like perturbations in mono- and bi-layer WSe2.
- Modifying the local band-gap through strain to funnel excitons.
- Developing strain-tuned quantum emitters for controlled single photon emission.
Main Results:
- Achieved deterministic creation of a two-dimensional lattice of quantum emitters.
- Demonstrated high-purity single photon emission from strain-tuned emitters.
- Obtained a mean positioning accuracy of 120±32 nm with near-unity emitter creation probability.
Conclusions:
- Nanoscale strain engineering enables deterministic positioning of quantum emitters in transition metal dichalcogenides.
- This method offers a scalable route for building quantum photonic devices.
- Further optimization of nanopillar dimensions can enhance positioning accuracy.
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