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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.

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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