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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Published on: September 5, 2019

Electrically Generated Exciton Polaritons with Spin On-Demand.

Yutao Wang^1,2,3, Giorgio Adamo^1,2, Son Tung Ha⁴

¹Centre for Disruptive Photonic Technologies, TPI, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.

Advanced Materials (Deerfield Beach, Fla.)

|November 26, 2024

Summary

Researchers demonstrate electrical generation of spin-polarized exciton polaritons using perovskite metasurfaces. This breakthrough enables electrical control of spin and directionality, advancing spintronic devices and inversionless spin-lasers.

Keywords:

Perovskite metasurfaces Spin‐polarized exciton‐polaritons electrical injection polaritons electrically‐tunable metadevices light emitting transistors

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Area of Science:

Condensed Matter Physics
Quantum Optics
Materials Science

Background:

Exciton polaritons are quasiparticles with potential in spintronics and quantum technologies.
Controlling their spin is crucial but challenging due to their charge neutrality and complex device requirements.

Purpose of the Study:

To demonstrate electrical generation and manipulation of spin-polarized exciton polaritons.
To develop a compact, tunable device for spintronic applications.

Main Methods:

Utilized a monolithic dielectric perovskite metasurface embedded in a light-emitting transistor.
Engineered in- and out-of-plane symmetry breaking to induce the polaritonic Rashba effect.
Leveraged spin-momentum locking for directional control.

Main Results:

Achieved electrical generation of spin-polarized exciton polaritons with high spin purity (S3 ≈ 0.8).
Demonstrated electrical control over the spin and emission directionality of polaritons.
Showcased a functional metatransistor device.

Conclusions:

The study advances the development of compact and tunable spintronic devices.
Represents a significant step towards electrically pumped inversionless spin-lasers.
Highlights the potential of perovskite metasurfaces for quantum information processing and spintronics.