Excitons are fundamental excitations that govern the optical properties of semiconductors. Interactions between excitons can lead to various emergent phases of matter and large nonlinear optical responses. In most semiconductors, excitons interact via exchange interactions or phase-space filling. Correlated materials that host excitons coupled to other degrees of freedom could offer pathways for controlling these interactions. Here we demonstrate magnon-mediated interactions between excitons in CrSBr, an antiferromagnetic semiconductor. These interactions manifest as the dependence of the exciton energy on the exciton density via a magnonic adjustment of the spin canting angle. Our study demonstrates the emergence of quasiparticle-mediated interactions in correlated quantum materials, leading to large nonlinear optical responses and potential device concepts such as magnon-mediated quantum transducers.

CREOL The College of Optics and Photonics University of Central Florida Orlando FL USA

Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center Universidad Autónoma de Madrid Madrid Spain

Department of Electrical Engineering The City College of New York New York NY USA

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

Department of Physics and Research Center OPTIMAS Rheinland Pfälzische Technische Universität Kaiserslautern Landau Kaiserslautern Germany

Department of Physics City College of New York New York NY USA

Department of Physics Graduate Center of the City University of New York New York NY USA

Materials Science Center National Renewable Energy Laboratory Golden CO USA

Photonics Initiative CUNY Advanced Science Research Center New York NY USA

Theory and Simulation of Condensed Matter King's College London London UK

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