In-plane and out-of-plane optical response of the nodal-line semimetals ZrGeS and ZrGeSe

J. Ebad-Allah, S. Rojewski, Y. L. Zhu, Z. Q. Mao, C. A. Kuntscher

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Polarization-dependent reflectivity measurements were carried out over a broad frequency range on single-crystalline ZrGeSe and ZrGeS compounds, which are closely related to the prototype nodal-line semimetal ZrSiS. These measurements revealed the strongly anisotropic character of both ZrGeSe and ZrGeS, with a reduced plasma frequency for the out-of-plane direction E∥c as compared with the in-plane direction E∥ab. For E∥ab, the optical conductivity spectrum consists of two Drude terms followed by a shoulder or plateaulike behavior and a distinct U shape at higher energies, while for E∥c, one Drude term is followed by a peaklike behavior, and the U shape of the profile is less developed. Under external pressure, two prominent excitations appear in the out-of-plane optical conductivity spectrum of ZrGeSe, whose frequency position and oscillator strength show a weak anomaly at ∼3 GPa. Overall, the pressure-induced changes in the profile of the E∥c conductivity spectrum are much enhanced >∼3 GPa. We compare our results to those recently reported for ZrSiS in a quantitative manner.

Original languageEnglish (US)
Article number075143
JournalPhysical Review B
Issue number7
StatePublished - Aug 15 2022

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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