Giant magneto-optical effect in the magnetic Weyl semimetal Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub>

ORAL

Abstract

The search for the topological materials has rapidly developed and novel phase of matter has been extensively proposed in recent years. In particular, the discovery of the Weyl semimetal (WSM), which has a pair of the Wey points with intense Berry curvature, is the important advance in this field. While the WSM shows various giant/functional electromagnetic phenomena such as the nonlinear optical effects and anomalous Hall effect (AHE), the direct evidence that the Weyl point plays the decisive role for those phenomena is still lacking. In this presentation, we will report the magneto-optical study on the recently discovered magnetic WSM Co3Sn2S2 with the giant AHE. The magneto-optical Kerr effect (MOKE) and first-principles calculations reveal that the optical Hall conductivity spectra are significantly dominated by the interband transition upon the nodal ring structures and the Weyl points. This observation demonstrates that those electronic structures play the decisive roles for the giant intrinsic AHE. We will also discuss the MOKE, which is exceptionally large compared with the conventional ferromagnetic metals.

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Presenters

  • Yoshihiro Okamura

    • Univ of Tokyo

Authors

  • Yoshihiro Okamura

    • Univ of Tokyo

  • Jo Muramoto

    • Univ of Tokyo

  • Susumu Minami

    • Kanazawa Univ
    • Kanazawa University

  • Yoshihiro Kato

    • Univ of Tokyo

  • Yukako Fujishiro

    • Univ of Tokyo

  • Yoshio Kaneko

    • RIKEN
    • Center for Emergent Matter Science (CEMS), RIKEN
    • RIKEN CEMS

  • Ryoma Kaneko

    • Univ of Tokyo

  • Kentaro Ueda

    • Univ of Tokyo

  • Vilmos Kocsis

    • RIKEN
    • Center for Emergent Matter Science (CEMS), RIKEN, Japan
    • Department of Physics, Budapest University of Technology and Economics, Hungary
    • Leibniz Institute for Solid State and Materials Research Dresden
    • RIKEN CEMS

  • Naoya Kanazawa

    • Univ of Tokyo

  • Yasujiro Taguchi

    • RIKEN
    • Center for Emergent Matter Science (CEMS), RIKEN, Japan
    • RIKEN CEMS

  • Takashi Koretsume

    • Tohoku University
    • Department of Physics, Tohoku University

  • Ryotaro Arita

    • University of Tokyo
    • Univ of Tokyo
    • Department of Applied Physics, The University of Tokyo

  • Yoshinori Tokura

    • RIKEN
    • Center for Emergent Matter Science (CEMS), RIKEN, Japan
    • CEMS, RIKEN
    • RIKEN CEMS and University of Tokyo
    • Center for Emergent Matter Science (CEMS), RIKEN
    • RIKEN CEMS
    • Department of Applied Physics, The University of Tokyo
    • The University of Tokyo
    • Center for Emergent Matter Science, RIKEN
    • RIKEN Center for Emergent Matter Science

  • Youtarou Takahashi

    • Applied physics, Univ of Tokyo
    • Univ of Tokyo