Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 29: Topology- and Symmetry-Protected Materials
O 29.8: Vortrag
Dienstag, 8. März 2016, 12:30–12:45, S051
2D Dirac cones protected by non-symmorphic symmetry in ZrSiS and ZrSiTe — •Andreas Topp1, Leslie M. Schoop1, Carola Straßer1, Bettina V. Lotsch1,2,3, and Christian R. Ast1 — 1Max Planck Institute for Solid State Research, D-70569 Stuttgart — 2Department of Chemistry, Ludwig-Maximilians-Universität, D-81377 München — 3Nanosystems Initiative Munich (NIM) & Center for Nanoscience, D-81377 München
Three-dimensional Dirac semimetals which accommodate massless Dirac and Weyl fermions, have recently become of considerable interest because of their exotic physical properties, e.g. an extremly high mobility and magnetoresistance. A new compound, ZrSiS, hosting a square lattice of Si atoms, has been shown to host 3D Dirac cones at the Fermi level with a very large energy range of linear dispersion [1]. Additionally, a new type of Dirac cone protected by non-symmorphic symmetry has been found to exist below the Fermi level which was predicted theoretically to exist in a square lattice [2]. Here, we show by ab initio calculations, that in the compound ZrSiTe this cone is moved to the Fermi level. We present the crystal growth results and show preliminary ARPES data concerning the electronic structure of these two compounds.
[1] L. M. Schoop et al., arXiv preprint arXiv:1509.00861 (2015).
[2] S. M. Young, and C. L. Kane, Phys. Rev. Lett. 115, 126803 (2015).