Magneto Exciton-Polaritons in van der Waals Magnets

Two-dimensional van der Waals (vdW) magnets that host excitons that show strong correlation to underlying magnetic order present a unique opportunity to realize strongly coupled magneto-exciton-polaritons. In this talk, I will discuss our work on CrSBr, a magnetic semiconductor where the excitons are naturally dressed by photons forming self-hybridized polaritons owing to the high dielectric constant [1]. I will first discuss the role of magnons in the exciton and polariton nonlinearity [2]. Following this, I will present some recent results on polariton confinement and propagation via structuring of CrSBr. I will conclude with a brief discussion on magnon dynamics probed via exciton-polaritons. [1] “Magneto-optics in a van der Waals magnet tuned by self-hybridized polaritons,” F. Dirnberger et al. Nature 620, 533 (2023). [2] "Magnon-mediated exciton-exciton interaction in a van der Waals antiferromagnet," B. Datta et al, ArXiv 2409.18501 (2024).