Multiphoton absorption provides symmetry-selective fingerprints for planar altermagnets, with two-photon response for d-wave, four-photon for g-wave, and six-photon for i-wave order via absent direct contributions in specific polarization channels.
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Multiphoton Fingerprints of Altermagnetic Spin Splittings
Multiphoton absorption provides symmetry-selective fingerprints for planar altermagnets, with two-photon response for d-wave, four-photon for g-wave, and six-photon for i-wave order via absent direct contributions in specific polarization channels.