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Evidence for three-dimensional Dirac conical bands in TlBiSSe by optical and magneto-optical spectroscopy

F. Le Mardelé1,2, J. Wyzula1,2, I. Mohelsky1, S. Nasrallah2,3, M. Loh2,4, S. Ben David2, O. Toledano2,5, D. Tolj6, M. Novak7 et al.

G. Eguchi3, S. Paschen3, N. Barišić3,7, J. Chen8, A. Kimura8,9, M. Orlita1,10, Z. Rukelj7,*, Ana Akrap2,†, and D. Santos-Cottin2,‡

  • 1LNCMI-EMFL, CNRS UPR3228, Université Grenoble Alpes, Université Toulouse, Université Toulouse 3, INSA-T, Grenoble and Toulouse, Cedex 9 38042, France
  • 2Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
  • 3Institute of Solid State Physics, TU Wien, A-1040 Vienna, Austria
  • 4Physics Department, Stanford University, Stanford, California 94305, USA
  • 5Departamento Física Interdisciplinar, Facultad de Ciencias, Universidad Nacional de Educación a Distancia (UNED), Avenida Esparta, E-28232 Las Rozas, Spain
  • 6Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
  • 7Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
  • 8Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
  • 9International Institute for Sustainability with Knotted Chiral Meta Matter (SKCM2), 1-3-2 Kagamiyama, Higashi-Hiroshima 739-8511, Japan
  • 10Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, CZ-121 16 Prague, Czech Republic

  • *rukelj@phy.hr
  • †ana.akrap@unifr.ch
  • ‡david.santos@unifr.ch
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Phys. Rev. B 107, L241101 – Published 1 June, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L241101

Abstract

TlBiSSe is a rare realization of a three-dimensional semimetal with a conically dispersing band that has an optical response which is well isolated from other contributions in a broad range of photon energies. We report optical and magneto-optical spectroscopy on this material. When the compound is chemically tuned into a state of the lowest carrier concentration, we find a nearly linear frequency dependence of the optical conductivity below 0.5 eV. Landau level spectroscopy allows us to describe the system with a massive Dirac model, giving a gap 2Δ=32 meV and an in-plane velocity parameter vxy=4.0×105 m/s.

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synopsis

A Textbook Dirac Semimetal

Published 1 June, 2023

Researchers have synthesized a chalcogenide compound that has the electronic structure of an ideal Dirac semimetal—which could facilitate the study of this exotic class of materials.

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Phys. Rev. B 107, L241101– Published 1 June, 2023
  • Received 14 January 2023
  • Accepted 11 April 2023
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