Topological chiral crystals have emerged as a fertile material platform for investigating optical phenomena derived from the distinctive Fermi surface Berry curvature and orbital magnetic moment textures around multifold chiral band crossings pinned at the time-reversal invariant momenta. In this work, by means of a tight-binding model and first-principles-based calculations, we investigate metallic electro-optic responses stemming from the Berry curvature and orbital magnetic moment of Bloch electrons across 37 materials belonging to space group 198 (SG198). Previously thought to vanish in SG198, our findings reveal a nonzero Berry curvature dipole attributed to the energetic misalignment between topologically charged point nodes of opposite chirality. Moreover, BeAu's large Fermi-level magnetoelectric electro-optic coefficient and small Fermi-level gyrotropic magnetic coefficient yield the lowest crossover bias field among the materials examined, well below the Berry curvature dipole critical field and favorable for isolating the magnetoelectric electro-optic effect.

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• Berry curvature
• Electro-optic effects
• Optoelectronics
• Topological materials
• Magnetic moment