Dirac cone protected by non-symmorphic symmetry and three-dimensional Dirac line node in ZrSiS

Leslie M. Schoop (), Mazhar N. Ali, Carola Straßer, Andreas Topp, Andrei Varykhalov, Dmitry Marchenko, Viola Duppel, Stuart S. P. Parkin, Bettina V. Lotsch () and Christian R. Ast
Additional contact information
Leslie M. Schoop: Max Planck Institute for Solid State Research
Mazhar N. Ali: Max Plank Institute for Microstructure Physics
Carola Straßer: Max Planck Institute for Solid State Research
Andreas Topp: Max Planck Institute for Solid State Research
Andrei Varykhalov: Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II
Dmitry Marchenko: Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II
Viola Duppel: Max Planck Institute for Solid State Research
Stuart S. P. Parkin: Max Plank Institute for Microstructure Physics
Bettina V. Lotsch: Max Planck Institute for Solid State Research
Christian R. Ast: Max Planck Institute for Solid State Research

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Materials harbouring exotic quasiparticles, such as massless Dirac and Weyl fermions, have garnered much attention from physics and material science communities due to their exceptional physical properties such as ultra-high mobility and extremely large magnetoresistances. Here, we show that the highly stable, non-toxic and earth-abundant material, ZrSiS, has an electronic band structure that hosts several Dirac cones that form a Fermi surface with a diamond-shaped line of Dirac nodes. We also show that the square Si lattice in ZrSiS is an excellent template for realizing new types of two-dimensional Dirac cones recently predicted by Young and Kane. Finally, we find that the energy range of the linearly dispersed bands is as high as 2 eV above and below the Fermi level; much larger than of other known Dirac materials. This makes ZrSiS a very promising candidate to study Dirac electrons, as well as the properties of lines of Dirac nodes.

Date: 2016
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DOI: 10.1038/ncomms11696

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