Magnetic switching of self-hybridized exciton-polaritons in CrSBr photonic crystal slabs

T. D. Gorelkina; I. E. Kalantaevskii; A. N. Abramov; K. A. Gasnikova; P. A. Alekseev; X. Zeng; D. Huang; T. Jiang; I. V. Iorsh; I. Y. Chestnov; V. Kravtsov

arXiv · 2604.11750

Magnetic switching of self-hybridized exciton-polaritons in CrSBr photonic crystal slabs

T. D. Gorelkina·I. E. Kalantaevskii·A. N. Abramov·K. A. Gasnikova·P. A. Alekseev·X. Zeng·D. Huang·T. Jiang·I. V. Iorsh·I. Y. Chestnov·V. Kravtsov

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Abstract

Layered van der Waals antiferromagnet CrSBr supports strong light--matter coupling and formation of magnetically tunable exciton-polaritons, yet active magnetic control over polariton propagation direction has remained elusive. Here, we investigate self-hybridized exciton-polaritons in photonic crystal slabs fabricated from CrSBr flakes and their evolution across the antiferromagnetic-to-ferromagnetic spin-flip transition induced by moderate in-plane magnetic fields. Using angle-resolved reflectance and photoluminescence spectroscopy supported by modeling, we show that the polariton energy continuously tracks the layer-by-layer magnetization switching, revealing a gradual redistribution of oscillator strength from antiferromagnetic to ferromagnetic excitons near the critical field. Most notably, we demonstrate that the sign of the polariton group velocity can be reversed by a small change in the external magnetic field of only 40 mT, resulting in complete switching of the polariton propagation direction. Our results establish CrSBr photonic crystal slabs as a platform for magnetically controlled polariton transport, opening opportunities for active integrated photonic and polaritonic devices.

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T. D. Gorelkina, I. E. Kalantaevskii, A. N. Abramov, K. A. Gasnikova, P. A. Alekseev, X. Zeng, D. Huang, T. Jiang, I. V. Iorsh, I. Y. Chestnov, V. Kravtsov. 2026-04-13. Magnetic switching of self-hybridized exciton-polaritons in CrSBr photonic crystal slabs. https://arxiv.org/abs/2604.11750

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