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Chiral multifold fermions are quasiparticles described by higher spingeneralizations of the Weyl equation, and are realized as low energyexcitations near symmetry protected band crossings in certain chiral crystals.In this work we calculate the linear optical conductivity of all chiralmultifold fermions. We show that it is enhanced with respect to that of Weylfermions with the same Fermi velocity, and features characteristic activationfrequencies for each multifold fermion class, providing an experimentalfingerprint to detect them. We calculate the conductivity for realistic chiralmultifold semimetals by using lattice tight-binding Hamiltonians that match theeffective models of multifold fermions at low energies, for space groups 199and 198. The latter includes RhSi, for which we give quantitative predictions,and also CoSi and AlPt. Our predictions can be tested in absorption orpenetration depth measurements, and are necessary to extract the recentlyproposed quantized photocurrents from experiments.

Linear optical conductivity of chiral multifold fermions