Theoretical study of topological properties of ferromagnetic pyrite CoS2

I. Robredo, N. B.M. Schröter, A. Reyes-Serrato, A. Bergara, F. De Juan, L. M. Schoop, M. G. Vergniory

Research output: Contribution to journalArticlepeer-review

Abstract

Since the discovery of the first topological material 15 years ago, the search for material realizations of novel topological phases has become the driving force of the field. While oftentimes we search for new materials, we forget that well established materials can also display very interesting topological properties. In this work, we revisit CoS 2, a metallic ferromagnetic pyrite that has been extensively studied in the literature due to its magnetic properties. We study the topological features of its electronic band structure and identify Weyl nodes and nodal lines, as well as a symmetry-protected fourfold fermion close to the Fermi level. Looking at different surface cleavage planes, we observe both spin polarized Fermi arcs in the majority channel and drumhead states. These findings suggest that CoS2 is a promising platform to study topological phenomena, as well as a good candidate for spintronic applications.

Original languageEnglish (US)
Article number304004
JournalJournal of Physics D: Applied Physics
Volume55
Issue number30
DOIs
StatePublished - Jul 28 2022

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Keywords

  • Fermi arcs
  • nodal lines
  • spintronics
  • Weyl semimetal

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