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O: Fachverband Oberflächenphysik
O 103: Topology and Symmetry Protected Materials I
O 103.9: Vortrag
Donnerstag, 19. März 2020, 12:30–12:45, WIL A317
Unveiling the complex band structure of the potential non-symmorphic topological insulator TaNiTe2 — •Tim Figgemeier1, Jennifer Neu2, Simon Moser3, Johannes Hessdörfer1, David J. Singh4, Theo M. Siegrist2,5, Hendrik Bentmann1, and Friedrich Reinert1 — 1Experimentelle Physik VII, Universität Würzburg — 2National High Magnetic Field Laboratory, Tallahassee, Florida — 3Experimentelle Physik IV, Universität Würzburg — 4University of Missouri, Columbia, Missouri — 5College of Engineering, FAMU-FSU, Tallahassee, Florida
NbNiTe2 and TaNiTe2 are layered van-der-Waals systems. While NbNiTe2 was discussed as a Weyl-semimetal candidate lately [1,2], TaNiTe2 (space group #53, Pmna) is predicted to be a topological insulator with non-symmorphic crystal structure, characterized by a topological inavriant of Z4 = 1 , that have rarely been studied experimentally up to now [3].
In this study we investigated the electronic structure of TaNiTe2 by means of angle-resolved photoemission (ARPES) experiments and first-principle calculations. Systematic photon-energy- and polarization-dependent measurements allow us to disentangle the highly complex band structure. More than that, we discuss indications for the presence of a topological surface state.
[1] Wang et al., PRB 95, 165114 (2017)
[2] Neu et al., PRB 100, 144102 (2019)
[3] Vergniory et al, Nature 544, 480-450 (2019)