Photoexcited excitons in the two-dimensional antiferromagnet CrSBr are found to act as a source of spin torque, driving nonlinear magnon dynamics through phase-coherent energy exchange that persists well beyond the optical pulse.
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https://doi.org/10.1038/s41563-026-02643-1(2026).Varela-Manjarres, J., Ren, Y. &...