Ferroelectric Modulation of Quantum Emitters in Monolayer WS₂.

Area of Science:

• Quantum photonics
• Materials science
• Condensed matter physics

Background:

• Single-photon sources are crucial for quantum technologies like secure communication and quantum computing.
• Current limitations in single-photon source quality hinder advancements in the field.
• Developing controllable and high-purity single-photon emitters is a significant scientific challenge.

Purpose of the Study:

• To present a novel method for controlling single-photon emitters (SPEs) and their purity.
• To demonstrate the integration of 2D materials with ferroelectric polymers for quantum applications.
• To explore the modulation of quantum light properties using ferroelectric domain control.

Main Methods:

• Integration of monolayer tungsten disulfide (WS₂) with poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) ferroelectric polymer.
• Utilizing ferroelectric domains within P(VDF-TrFE) to influence single-photon emission from WS₂.
• Switching ferroelectric polarization to tune and modulate single-photon purity.

Main Results:

• Ferroelectric domains in P(VDF-TrFE) were shown to control the purity of single-photon emission from WS₂.
• Reversible tuning of single-photon purity between semiclassical and quantum light regimes was achieved.
• Single-photon purities as high as 94% were demonstrated, indicating high-quality quantum light generation.

Conclusions:

• A new paradigm for controlling single-photon emitters and their purity has been established.
• This heterostructure offers a method for modulating and encoding quantum photonic information.
• The combination of ferroelectric properties and 2D materials provides a promising platform for advanced quantum technologies.