For a p-wave magnet with Rashba coupling, the optical conductivity at the band edge vanishes for a specific light ellipticity when the Néel vector is along the y axis, allowing optical determination of the Néel vector.
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Quantum geometry and elliptic optical dichroism in $p$-wave magnets
For a p-wave magnet with Rashba coupling, the optical conductivity at the band edge vanishes for a specific light ellipticity when the Néel vector is along the y axis, allowing optical determination of the Néel vector.