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arXiv · 2103.15178

Broadband optical conductivity of the chiral multifold semimetal PdGa

L. Z. Maulana·Z. Li·E. Uykur·K. Manna·S. Polatkan·C. Felser·M. Dressel·A. V. Pronin
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Abstract

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.

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L. Z. Maulana, Z. Li, E. Uykur, K. Manna, S. Polatkan, C. Felser, M. Dressel, A. V. Pronin. 2021-03-28. Broadband optical conductivity of the chiral multifold semimetal PdGa. https://doi.org/10.1103/physrevb.103.115206

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