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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 43: Poster Tuesday: Electronic Structure

O 43.2: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Drumhead Surface States in ZrSiTe — •Andreas Topp1, Lukas Müchler2, Raquel Queiroz3,1, Bettina V. Lotsch1, Leslie M. Schoop4, and Christian R. Ast11Max Planck Institute for Solid State Research, Stuttgart, DEU-70569 — 2Flatiron Institute, New York, USA-10010 — 3Weizmann Insitute of Science, Rehovot, ISR-7610001 — 4Department of Chemistry, Princeton University, Princeton, USA-08544

ZrSiS, ZrSiTe and related compounds have become of increased interest in recent years. As members of space group 129, their crystal structure contains nonsymmorphic symmetry elements in combination with a square-net lattice of atoms. While the nonsymmorphic symmetry is responsible for band crossings at high-symmetry points that are not affected by spin-orbit coupling, the square net produces a Dirac line node forming a diamond-like structure in the first Brillouin zone. ARPES measurements showed additional surface states in ZrSiS that could be explained in the framework of reduced surface symmetry [1]. Here, we focus on the isostructural compound ZrSiTe, which shows an even more complicated surface band structure and explain the emergent surface bands in the context of topological drumhead surface states [2].
Topp et al., Phys. Rev. X 7, 041073 (2017).
Y.-H. Chan et al., Phys. Rev. B 93, 205132 (2016).

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