Real-space imaging of surface-magnetism in magnetic Weyl semimetal candidate CeBi

ORAL

Abstract

Magnetic Weyl semimetals host chiral Weyl nodes in their bulk which are formed by broken time-reversal symmetry, caused, for example, by intrinsic ferromagnetic order. While the bulk-surface correspondence dictates the formation of Fermi arcs connecting Weyl nodes with opposite chirality, their momentum-space contour and their connectivity (i.e. which Weyl points they are connecting to), depends on surface properties. Here we use spin-polarized scanning tunneling microscopy to map the magnetic structure on the surface of CeBi at various bulk-magnetic phases. We find unexpected surface-magnetic order with strongly bias-dependent magnetic contrast and phase. We discuss our observation in terms of Fermi arc connectivity and magnetic interactions in CeBi.

*This work was supported by DOE EFRC, Center for the Advancement of Topological Semimetals, Swiss National Science foundation under Grant P400P2_183890, U.S. DOE, BES, DMSE under Contract No. DEAC0207CH11358, and Gordon and Betty Moore Foundation's EPiQS Initiative through Grant GBMF4536 and GBMF4411.

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Presenters

  • Christian Matt

    • Harvard University
    • Department of Physics, Harvard University

Authors

  • Christian Matt

    • Harvard University
    • Department of Physics, Harvard University

  • Yu Liu

    • Harvard University

  • Nathan C Drucker

    • Harvard University

  • Harris Pirie

    • Harvard University
    • Department of Physics, Harvard University

  • Robert-Jan Slager

    • Harvard University
    • Department of Physics, Harvard University
    • Harvard

  • Na Hyun Jo

    • Ames Laboratory
    • Department of Physics and Astronomy, Ames Laboratory/Iowa State Univeristy

  • Brinda Kuthanazhi

    • Ames Laboratory, Iowa State University
    • Iowa State University
    • Department of Physics & Astronomy, Iowa State University/Ames Laboratory
    • Department of Physics and Astronomy, Ames Laboratory/Iowa State Univeristy
    • Iowa State University/Ames Laboratory

  • Sergey L. Bud'ko

    • Iowa State University
    • Ames Laboratory and Iowa State University
    • Ames Lab
    • Ames laboratory, Ames, IA
    • Department of Physics & Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory
    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Iowa State University and Ames Laboratory
    • Iowa State University, Ames Laboratory
    • Division of Materials Sciences & Engineering, Ames Lab and Iowa State University
    • Iowa State University/Ames Laboratory

  • Paul C Canfield

    • Iowa State University
    • Ames Laboratory and Iowa State University
    • Ames Lab
    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
    • Ames laboratory, Ames, IA
    • Ames Laboratory, Iowa State University
    • Department of Physics & Astronomy, Iowa State University/Ames Laboratory
    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Iowa State University and Ames Laboratory
    • Iowa State University, Ames Laboratory
    • Department of Physics and Astronomy, Iowa State University
    • Division of Materials Sciences & Engineering, Ames Lab and Iowa State University
    • Department of Physics and Astronomy, Ames Laboratory/Iowa State Univeristy
    • Iowa State University/Ames Laboratory

  • Jennifer E. Hoffman

    • Harvard University
    • Physics, Harvard University
    • Department of Physics, Harvard University