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

By L. Schoop, Mazhar N. Ali, C. Strasser, A. Topp, A. Varykhalov, D. Marchenko, V. Duppel, Stuart S. P. Parkin, Bettina V. Lotsch, C. Ast. Nature Communications, 2015

664 citations recorded by the source corpus.

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. The family of topological materials has been growing rapidly but most members bare limitations hindering the study of exotic behaviour of topological particles. Here, Schoop et al. report a Fermi surface with a diamond-shaped line of Dirac nodes in ZrSiS, providing a promising candidate for studying two-dimensional Dirac fermions.

Subfields: Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/5b9250c99a14b61f355a5cec8c0be4c0ae6b787e

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Citations in the corpus

Unconventional mass enhancement around the Dirac nodal loop in ZrSiS (2017, background): “S5 of the Supplementary Information, ﬁrmly establish the topological nodal loop structure in ZrSiS that was predicted in earlier band structure calculations [12, 26].”
Weyl and Dirac semimetals in three-dimensional solids (2017, background): “They may have been observed in ZrSiS (Neupane et al., 2016; Schoop et al., 2016), PbTaSe2 (Bian et al., 2016a), HfSiS (Takane et al., 2016), and TlTaSe2 (Bian et al., 2016b) via ARPES.”
Beyond Dirac and Weyl fermions: Unconventional quasiparticles in conventional crystals (2016, background): “Last, all of the fermion types are also detectable via angle-resolved photoemission spectroscopy (ARPES) [for example, similar experimental results in (44)] and through quantum oscillation experiments.”
Topological Semimetals from First Principles (2018, background): “A large number of materials have been theoretically identified in this class of the nodal line semimetals, with the experimental realizations in graphite (130, 131), ZrSiS family (132, 36, 133, 134, 135) and TiB2 family (136, 137), Mg3Bi2 (138).”
Topological Semimetals in Square-Net Materials (2018, methodology): “PbFCl-type materials partially match the prediction by Young and Kane and have been investigated in this regard (35, 9, 36, 37, 38, 16, 39, 40, 41).”