Broadband optical conductivity of the chiral multifold semimetal PdGa

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

doi:10.1103/PhysRevB.103.115206

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Broadband optical conductivity of the chiral multifold semimetal PdGa

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Manna, K.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser, C.
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Maulana, L. Z., Li, Z., Uykur, E., Manna, K., Polatkan, S., Felser, C., et al. (2021). Broadband optical conductivity of the chiral multifold semimetal PdGa. Physical Review B, 103(11): 115206, pp. 1-6. doi:10.1103/PhysRevB.103.115206.

Cite as: https://hdl.handle.net/21.11116/0000-0008-739D-6

Abstract

We present an optical conductivity study of the multifold semimetal PdGa, performed in a broad spectral range (100-20 000 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. © 2021 American Physical Society.