Pressure-induced excitations in the out-of-plane optical response of the nodal-line semimetal ZrSiS

0563664 - FZÚ 2023 RIV US eng J - Journal Article
Ebad-Allah, J. - Rojewski, S. - Vöst, M. - Eickerling, G. - Scherer, W. - Uykur, E. - Sankar, R. - Varrassi, L. - Franchini, C. - Ahn, Kyo-Hoon - Kuneš, Jan - Kuntscher, C.A.
Pressure-induced excitations in the out-of-plane optical response of the nodal-line semimetal ZrSiS.
Physical Review Letters. Roč. 127, č. 7 (2021), č. článku 076402. ISSN 0031-9007. E-ISSN 1079-7114
Institutional support: RVO:68378271
Keywords : ZrSiS * nodal-line semimetal * pressure-induced excitations
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 9.185, year: 2021
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevLett.127.076402

The anisotropic optical response of the layered, nodal-line semimetal ZrSiS at ambient and high pressure is investigated by frequency-dependent reflectivity measurements for the polarization along and perpendicular to the layers. The highly anisotropic optical conductivity is in very good agreement with results from density-functional theory calculations and confirms the anisotropic character of ZrSiS. Whereas the in-plane optical conductivity shows only modest pressure-induced changes, we found strong effects on the out-of-plane optical conductivity spectrum of ZrSiS, with the appearance of two prominent excitations. These pronounced pressure-induced effects can neither be attributed to a structural phase transition according to our single-crystal x-ray diffraction measurements, nor can they be explained by electronic correlation and electron-hole pairing effects, as revealed by theoretical calculations.
Permanent Link: https://hdl.handle.net/11104/0335557