Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 46: Electronic Structure of Surfaces: Spectroscopy, Surface States

O 46.5: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1A

2D Dirac cones at the Fermi level in ZrSiTe — •Shweta Sheoran1, Andreas Topp1, Judith M. Lippmann1,2, Andrei Varykhalov3, Viola Duppel1, Bettina V. Lotsch1,2,4, Christian R. Ast1, and Leslie M. Schoop11Max Planck Institute for Solid State Research, D-70569 Stuttgart — 2Department of Chemistry, Ludwig-Maximilians-Universität, D-81377 München — 3Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II, D-12489 Berlin — 4Nanosystems Initiative Munich (NIM) & Center for Nanoscience, D-80799 München

A new class of materials exhibiting non-symmorphic symmetry has generated great interest, due to the associated rich physics such as ultra high mobility, giant magneto-resistance and also it’s essential role in the discovery of new quasi particles beyond the usual Dirac, Weyl and Majorana fermions. Experimental analysis shows that the material ZrSiS, exhibits Dirac cones protected by non-symmorphic symmetry below the Fermi level [1]. A major requirement for pinning these non-symmorphic crossings at the Fermi level is a half filled band, which is quite difficult to achieve. A possible workaround could be the application of uniaxial tensile strain. In ZrSiS, this would be equivalent to substitution of S by Te, leading to the isostructural and isoelectronic compound ZrSiTe. Here we present the DFT bandstructure calculations and ARPES measurements performed on ZrSiTe, showing that it exhibits a Dirac line node on the Fermi level.

[1] Schoop, L.M. et al., Nat.Commun. 7, 11696 (2016).

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