Magnetic control of an exciton-polariton condensate in a van der Waals magnet.

Magnetically tunable exciton-polariton condensation in CrSBr microcavities is achieved, with the condensate energy shifted by up to 10.5 meV using an external 2 T magnetic field.

• Why it matters: Spin-linked control of macroscopic quantum condensates is a key missing capability for exciton-polaritons, limiting spin-based “knobs” for coherent quantum light sources.
• What they did: CrSBr microwires embedded in an optical cavity were photoexcited to form polariton condensates, and the condensate energy was tracked as an external magnetic field was varied up to 2 T.
• The result: The strong coupling between CrSBr spin order and excitonic correlations enables magnetic tuning of the condensate energy by as much as 10.5 meV, establishing a platform for magnetic control of polariton condensates.

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