Defects in magnetic Weyl semimetal Co3Sn2S2

ORAL

Abstract

In Co3Sn2S2, a magnetic Weyl semimetal with kagome-lattice, the existence of bulk Weyl nodes, which are formed under broken inversion or time-reversal symmetry, creates nontrivial topological properties, for example, robust Giant anomalous hall effect. The surface–bulk correspondence ensures the bulk bands related topological “Fermi arc” surface bands dispersion. In this presentation, we use low temperature high magnetic field scanning tunneling microscope, spin polarized STM, and quasiparticle interference (QPI) to study the influence of local defects including magnetic and nonmagnetic vacancies and adatoms to the Weyl nodes movement. Co and Sn vacancies in the Kagome-lattice are identified, their behavior under magnetic field are studied. S adatoms in 1D forms are compared with individual adatoms. The interplay among topology, defects and magnetism are discussed for the understanding of the involved quantum phenomena.

*This research was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility.

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Presenters

  • Qiang Zou

    • Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge, TN 37831, USA
    • CNMS, Oak Ridge National Lab

Authors

  • Qiang Zou

    • Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge, TN 37831, USA
    • CNMS, Oak Ridge National Lab

  • Mingming Fu

    • CNMS, Oak Ridge National Lab

  • Mina Yoon

    • Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A.
    • Center for Nanophase Materials Sciences, Oak Ridge National Laboratory
    • CNMS, Oak Ridge National Lab
    • Oak Ridge National Lab

  • Rui Xue

    • University of Tennessee, Knoxville

  • David Mandrus

    • Physics, University of Tennessee
    • Materials Science and Engineering, The University of Tennessee
    • Department of Materials Science & Engineering, University of Tennessee, Knoxville
    • The University of Tennesse, Knoxville
    • University of Tennessee
    • Department of Physics and Astronomy, University of Tennessee
    • Oak Ridge National Laboratory
    • Department of Materials Science and Engineering, University of Tennessee Knoxville
    • Department of Materials Science and Engineering, University of Tennessee
    • University of Tennessee, Knoxville
    • Material Science and Technology Division, Oak Ridge National Laboratory
    • Material Science and Technology Division, Oak Ridge National Lab

  • Zheng Gai

    • Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge, TN 37831, USA
    • Center for Nanophase Materials Sciences, Oak Ridge National Laboratory
    • CNMS, Oak Ridge National Lab
    • Center for Nanophase Materials Sciences, Oak Ridge National Lab