Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 29: Topology- and Symmetry-Protected Materials
O 29.7: Vortrag
Dienstag, 8. März 2016, 12:15–12:30, S051
Dirac Cone Protected by Non-Symmorphic Symmetry and highly dispersive 3D Dirac crossings in ZrSiS — •Leslie Schoop1, Mazhar Ali2, Carola Straßer1, Viola Duppel1, Stuart Parkin2, Bettina Lotsch1, and Christian Ast1 — 1Max Planck Insititut für Festkörperforschung, Stuttgart — 2Max Planck Institut für Mikrostrukturphysik, Halle
Materials harboring exotic quasiparticles, such as Dirac and Weyl fermions have garnered much attention from the physics and material science communities. Here, we show with angle resolved photoemission studies supported by ab initio calculations that the highly stable, non-toxic and earth-abundant material, ZrSiS, has an electronic band structure that hosts several Dirac cones which form a Fermi surface with a diamond-shaped line of Dirac nodes. We also experimentally show, for the first time, that the square Si lattice in ZrSiS is an excellent template for realizing the new types of 2D Dirac cones protected by non-symmophic symmetry and image an unforseen surface state that arises close to the 2D Dirac cone. 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 any known Dirac material so far. We will discuss why these characteristics make ZrSiS very promising for future applications.