Magneto-Optics of a Weyl Semimetal beyond the Conical Band Approximation: Case Study of TaP

S. Polatkan, M. O. Goerbig, J. Wyzula, R. Kemmler, L. Z. Maulana, B. A. Piot, I. Crassee, A. Akrap, C. Shekhar, C. Felser, M. Dressel, A. V. Pronin, and M. Orlita
Phys. Rev. Lett. 124, 176402 – Published 28 April 2020
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Abstract

Landau-level spectroscopy, the optical analysis of electrons in materials subject to a strong magnetic field, is a versatile probe of the electronic band structure and has been successfully used in the identification of novel states of matter such as Dirac electrons, topological materials or Weyl semimetals. The latter arise from a complex interplay between crystal symmetry, spin-orbit interaction, and inverse ordering of electronic bands. Here, we report on unusual Landau-level transitions in the monopnictide TaP that decrease in energy with increasing magnetic field. We show that these transitions arise naturally at intermediate energies in time-reversal-invariant Weyl semimetals where the Weyl nodes are formed by a partially gapped nodal-loop in the band structure. We propose a simple theoretical model for electronic bands in these Weyl materials that captures the collected magneto-optical data to great extent.

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  • Received 16 December 2019
  • Accepted 9 April 2020

DOI:https://doi.org/10.1103/PhysRevLett.124.176402

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. Polatkan1, M. O. Goerbig2, J. Wyzula3, R. Kemmler1, L. Z. Maulana1, B. A. Piot3, I. Crassee3, A. Akrap4, C. Shekhar5, C. Felser5, M. Dressel1, A. V. Pronin1, and M. Orlita3,6,*

  • 11. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
  • 2Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS UMR 8502, 91405 Orsay Cedex, France
  • 3Laboratoire National des Champs Magnétiques Intenses, CNRS-UGA-UPS-INSA-EMFL, 25 rue des Martyrs, 38042 Grenoble, France
  • 4Department of Physics, University of Fribourg, Chemin du Musée 3, CH-1700 Fribourg, Switzerland
  • 5Max Planck Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany
  • 6Charles University, Faculty of Mathematics and Physics, Institute of Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic

  • *milan.orlita@lncmi.cnrs.fr

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Issue

Vol. 124, Iss. 17 — 1 May 2020

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