Determination of the crystal field splitting energy in Cd3As2 using magnetooptics

G. Krizman, T. Schumann, S. Tchoumakov, B. A. Assaf, S. Stemmer, L. A. de Vaulchier, and Y. Guldner
Phys. Rev. B 100, 155205 – Published 18 October 2019

Abstract

Symmetry considerations are of extreme importance to the topological properties of crystals. A crystal field splitting δ yields Dirac nodes near the Brillouin zone center in Cd3As2, but its value has yet to be determined with precision. We study the band structure of Cd3As2 using magnetooptical infrared spectroscopy measurements on epilayers with low carrier density grown by molecular beam epitaxy. By combining angular dependent cyclotron resonance with Landau level spectroscopy measurements in the Faraday geometry, we determine that δ is positive and equal to 15±5 meV in Cd3As2. Our results lead to a more accurate knowledge of the details of the band structure of this Dirac semimetal such as the position its Dirac nodes in momentum space and their splitting into Weyl nodes under a magnetic field.

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  • Received 11 June 2019
  • Revised 18 September 2019

DOI:https://doi.org/10.1103/PhysRevB.100.155205

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

G. Krizman1, T. Schumann2, S. Tchoumakov3, B. A. Assaf1,4, S. Stemmer2, L. A. de Vaulchier1, and Y. Guldner1

  • 1Laboratoire de Physique de l’Ecole normale supérieure, ENS, Université PSL, CNRS, Sorbonne Université, 24 Rue Lhomond 75005 Paris, France
  • 2Materials Department, University of California, Santa Barbara, California 93106, USA
  • 3Département de Physique, Université de Montréal, Quebec, H3C 3J7, Canada
  • 4Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA

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Issue

Vol. 100, Iss. 15 — 15 October 2019

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