Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 48: Topological Semimetals - Experiment (joint session TT/MA)

MA 48.3: Talk

Thursday, April 4, 2019, 15:30–15:45, H2

Magneto-optical response of the Weyl semimetal TaP — •Sascha Polatkan¹, Milan Orlita², Artur Slobodeniuk², Mark O. Goerbig³, Chandra Shekhar⁴, Claudia Felser⁴, Martin Dressel¹, and Artem V. Pronin¹ — ¹1. Physikalisches Institut, Universität Stuttgart, 70569 Stuttgart, Germany — ²LNCMI, CNRS-UGA-UPS-INSA-EMFL, 38042 Grenoble, France — ³LPS, Univ. Paris-Sud, Univ. Paris-Saclay, CNRS UMR 8502, 91405 Orsay, France — ⁴MPI für Chemische Physik fester Stoffe, 01187 Dresden, Germany

Theory predicts that TaP, being structurally akin to TaAs, hosts two distinct Weyl-type band crossings. Optical (infrared) spectroscopy in magnetic fields offers crucial information about the band structure by means of analyzing the inter-Landau-level transitions. We investigated the magneto-optical response of TaP up to B = 33 T in the infrared regime (5 − 200 meV). The reflection spectra are rich of features, many of which show a √B-dependence, hinting at the massless nature of the involved (presumably Weyl) bands. Moreover, we observe a peculiar fan-shaped subset of the transitions. In this subset, the energies of some of the transitions increase, while the energies of other transitions decrease with field. We discuss how the topological nature of the involved bands might be connected to this peculiar behavior.