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Title: Optical Rashba effect in a light-emitting perovskite metasurface
Authors: Tian, Jingyi
Adamo, Giorgio
Liu, Hailong
Klein, Maciej
Han, Song
Liu, Hong
Soci, Cesare
Keywords: Science::Physics
Issue Date: 2022
Source: Tian, J., Adamo, G., Liu, H., Klein, M., Han, S., Liu, H. & Soci, C. (2022). Optical Rashba effect in a light-emitting perovskite metasurface. Advanced Materials, 34(12), e2109157-.
Project: A18A7b0058 
Journal: Advanced Materials
Abstract: The Rashba effect, i.e., the splitting of electronic spin-polarized bands in the momentum space of a crystal with broken inversion symmetry, has enabled the realization of spin-orbitronic devices, in which spins are manipulated by spin-orbit coupling. In optics, where the helicity of light polarization represents the spin degree of freedom for spin-momentum coupling, the optical Rashba effect is manifested by the splitting of optical states with opposite chirality in the momentum space. Previous realizations of the optical Rashba effect relied on passive devices determining the surface plasmon or light propagation inside nanostructures, or the directional emission of chiral luminescence when hybridized with light-emitting media. An active device underpinned by the optical Rashba effect is demonstrated here, in which a monolithic halide perovskite metasurface emits highly directional chiral photoluminescence. An all-dielectric metasurface design with broken in-plane inversion symmetry is directly embossed into the high-refractive-index, light-emitting perovskite film, yielding a degree of circular polarization of photoluminescence of 60% at room temperature.
ISSN: 0935-9648
DOI: 10.1002/adma.202109157
Rights: © 2022 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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