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 conductivity at frequencies below 4000 cm-1 is dominated by free carriers while at higher frequencies interband transitions provide the major contribution. The spectra do not demonstrate a significant temperature evolution: only the intraband part changes as a function of temperature with the plasma frequency remaining constant. The interband contribution to the conductivity exhibits a broad peak at around 5500 cm-1 and increases basically monotonously at frequencies above 9000 cm-1. The band-structure-based computations reproduce these features of the interband conductivity and predict its linear-in-frequency behavior as frequency diminishes.
@article{arxiv.2103.15178,
title = {Broadband optical conductivity of the chiral multifold semimetal PdGa},
author = {L. Z. Maulana and Z. Li and E. Uykur and K. Manna and S. Polatkan and C. Felser and M. Dressel and A. V. Pronin},
journal= {arXiv preprint arXiv:2103.15178},
year = {2021}
}