The coupling of light with excitations in matter is one of the most important concepts to make photons interact, crucial for the development of efficient optoelectronic devices. In materials with exceptionally strong light-matter interaction, excitons can hybridize with photons without the need of an external cavity. Here, we report the electrical excitation of such self-hybridized polaritons in the van der Waals antiferromagnet CrSBr. We exploit an unconventional excitation via energy transfer from tunneling electrons in graphene tunnel junctions to strongly bound excitons in proximate CrSBr layers. This enables us to excite CrSBr crystals ranging in thickness from a bilayer up to 250 nanometers, with the strong linear polarization of the electroluminescence confirming the excitonic origin. We assign the electrically excited emission to self-hybridized exciton polaritons, highlighting the strong coupling between optical excitations and confined photon modes in CrSBr. Our findings not only offer an efficient method to generate polaritons electrically but also create opportunities for future spintronic devices.

Department of Inorganic Chemistry University of Chemistry and Technology Prague Prague 166 28 Czech Republic

Institut de Physique et Chimie des Matériaux de Strasbourg Université de Strasbourg CNRS Strasbourg UMR 7504 France

International Center for Materials Nanoarchitectonics National Institute for Materials Science Tsukuba Ibaraki 305 004 Japan

Munich Center for Quantum Science and Technology Technical University of Munich Garching Germany

Photonics Laboratory ETH Zürich Zürich 8093 Switzerland

Physics Department TUM School of Natural Sciences Technical University of Munich Munich Germany

Research Center for Functional Materials National Institute for Materials Science Tsukuba Ibaraki 305 004 Japan

Zentrum für Quantum Engineering Technical University of Munich Garching Germany

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