Broadband optical conductivity of the chiral multifold semimetal PdGa

We present an optical conductivity study of the multifold semimetal PdGa, performed in a broad spectral range (100 - 20000 cm-1; 12 meV 2.5 eV) down to T = 10 K. The at frequencies below 4000 cm-1 is dominated by free carriers while higher interband transitions provide major contribution. spectra do not demonstrate significant temperature evolution: only intraband part changes as function with plasma frequency remaining constant. contribution exhibits peak around 5500 and increases basically monotonously above 9000 cm-1. band-structure-based computations reproduce these features predict its linear-in-frequency behavior diminishes.