Chemical pressure effect on the optical conductivity of the nodal-line semimetals ZrSiY (Y = S, Se, Te) and ZrGeY (Y = S, Te)

0521286 - FZÚ 2020 RIV US eng J - Článek v odborném periodiku
Ebad-Allah, J. - Afonso, J.F. - Krottenmüller, M. - Hu, J. - Zhu, Y.L. - Mao, Z.Q. - Kuneš, Jan - Kuntscher, C.A.
Chemical pressure effect on the optical conductivity of the nodal-line semimetals ZrSiY (Y = S, Se, Te) and ZrGeY (Y = S, Te).
Physical Review B. Roč. 99, č. 12 (2019), s. 1-8, č. článku 125154. ISSN 2469-9950. E-ISSN 2469-9969
GRANT EU: European Commission(XE) 646807 - EXMAG
Institucionální podpora: RVO:68378271
Klíčová slova: chemical bonds * density functional theory * electronic structure * germanium compounds * optical conductivity
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.575, rok: 2019
Způsob publikování: Omezený přístup
https://doi.org/10.1103/physrevb.99.125154

ZrSiS is a nodal-line semimetal, whose electronic band structure contains a diamond-shaped line of Dirac nodes. We carried out a comparative study on the optical conductivity of ZrSiS and the related compounds ZrSiSe, ZrSiTe, ZrGeS, and ZrGeTe by reflectivity measurements over a broad frequency range combined with density functional theory calculations. The optical conductivity exhibits a distinct U shape, ending at a sharp peak at around 10000cm−1 for all studied compounds except for ZrSiTe. The U shape of the optical conductivity is due to transitions between the linearly dispersing bands crossing each other along the nodal line. The sharp high-energy peak is related to transitions between almost parallel bands, and its energy position depends on the interlayer bonding correlated with the c/a ratio, which can be tuned by either chemical or external pressure.
Trvalý link: http://hdl.handle.net/11104/0305918