Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 48: Topological Semimetals - Experiment (joint session TT/MA)

MA 48.5: Talk

Thursday, April 4, 2019, 16:00–16:15, H2

Chemical-pressure effect on the optical conductivity of topological nodal-line semimetals of ZrSiS type — •Markus Krottenmüller¹, Jihaan Ebad-Allah^1,2, Juan Fernandez Afonso³, Zhiqiang Mao⁴, Jan Kunes^3,5, and Christine Kuntscher¹ — ¹Experimentalphysik II, Universität Augsburg, 86159 Augsburg, Germany — ²Department of Physics, Tanta University, 31527 Tanta, Egypt — ³Institute of Solid State Physics, TU Wien, 1020 Vienna, Austria — ⁴Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118, USA — ⁵Institute of Physics, The Czeck Academy of Sciences, 18221 Praha, Czech Republic

ZrSiS is a prototype nodal-line semimetal, whose electronic band structure contains a diamond-shaped nodal line. We studied the optical conductivity of ZrSiS and other members of the compound family ZrXY with X=Si, Ge and Y =S, Se, Te by reflectivity measurements over a broad frequeny range. The optical conductivity spectrum of ZrSiS has a distinct U-shape, ending at a sharp high-energy peak. Other ZrXY compounds have a very similar profile of the optical conductivity, except ZrSiTe. We will discuss our findings in terms of the theoretical optical conductivity obtained by density functional theory calculations.