Electrically generated exciton polaritons with spin on-demand

TL;DR

This paper demonstrates the electrical generation and control of spin-polarized exciton polaritons in a dielectric perovskite metasurface, enabling potential applications in spintronics and quantum technologies.

Contribution

It introduces a novel device architecture that electrically generates and manipulates spin-polarized polaritons using symmetry-breaking metasurfaces.

Findings

Achieved high spin purity with normalized Stokes parameter S3~0.8.

Demonstrated electrical control of spin and emission directionality.

Realized a step toward electrically pumped spin-lasers.

Abstract

Generation and manipulation of exciton polaritons with controllable spin could deeply impact spintronic applications, quantum simulations, and quantum information processing, but is inherently challenging due to the charge neutrality of the polariton and the device complexity it requires. In this work, we demonstrate electrical generation of spin-polarized exciton polaritons in a monolithic dielectric perovskite metasurface embedded in a light-emitting transistor. A finely tailored interplay of in- and out-of-plane symmetry breaking of the metasurface allows to lift the spin degeneracy through the polaritonic Rashba effect, yielding high spin purity with normalized Stokes parameter of S3~0.8. Leveraging on spin-momentum locking, the unique metatransistor device architecture enables electrical control of spin and directionality of the polaritonic emission. This work advances the development of compact and tunable spintronic devices, and represents an important step toward the realization of electrically pumped inversionless spin-lasers.