SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Topological Semimetals
TT 6.10: Vortrag
Montag, 27. März 2023, 12:00–12:15, HSZ 304
Field-tunable inverted band gap in GdPtBi: A magneto-optical study — •S. Polatkan1, E. Uykur1, A. V. Pronin1, M. Orlita2, I. Mohelsky2, J. Wyzula2, C. Shekhar3, C. Felser3, and M. Dressel1 — 11. Physikalisches Institut, Universität Stuttgart, 70569 Stuttgart, Germany — 2LNCMI, CNRS-UGA-UPS-INSA-EMFL, 38042 Grenoble, France — 3Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany
GdPtBi is a half-Heusler compound that was suggested to host triple-point fermions. Such fermions may be transformed into Weyl fermions in magnetic fields. We present magneto-optical data alongside a k · p model, evidencing the exchange-interaction mediated pseudo-Zeeman splitting of the parabolic band touching at the Γ point predicted by DFT, and thus prove the existence of highly tunable Weyl cones.