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TT: Fachverband Tiefe Temperaturen

TT 6: Topological Semimetals

TT 6.10: Talk

Monday, March 27, 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.