Electronic structure of a metallic ferromagnetic pyrite

ORAL

Abstract

In this work we present combined experimental and theoretical results to elucidate electronic and magnetic properties of metallic cobalt pyrite CoS2. On one side we reveal that the Density Functional Theory predicted band structure is in good agreement with angular resolved photoemission spectroscopy (ARPES) measurements, performed for the first time. Further studying its band structure we discovered that this material exhibits topological behaviour. Close to the Fermi level, we found a potential 'New Fermion', a 4-dimensional magnetic band crossing protected by cubic, non-symmorphic magnetic symmetries, along with several neighbouring Weyl fermions. We finally analyze the surface states and identify surface Fermi arcs.

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Presenters

  • Iñigo Robredo

    • Donostia International Physics Center

Authors

  • Iñigo Robredo

    • Donostia International Physics Center

  • Niels Schröter

    • PSI
    • Paul Scherrer Institute

  • Sebastian Klemenz

    • Princeton University
    • Princeton

  • Robert Kirby

    • Princeton University
    • Princeton

  • Andreas P Schnyder

    • Max-Planck Institute for Solid State Physics
    • Max Planck Institute for Solid State Research
    • MPI Stuttgart

  • Aitor Bergara

    • EHU/UPV
    • Centro de Física de Materiales

  • Vladimir Strokov

    • PSI
    • Paul Scherrer Institute

  • Jonas A. Krieger

    • PSI
    • Paul Scherrer Institute

  • Tianlun Yu

    • PSI

  • Fernando de Juan

    • Univ del Pais Vasco
    • Donostia International Physics Center
    • IKERBASQUE

  • Maia G Vergniory

    • Donostia International Physics Center
    • Donostia International Physics Center, Donostia-San Sebastian, Spain

  • Leslie Schoop

    • Princeton University
    • Department of Chemistry, Princeton University
    • Princeton