Probing band topology of Weyl-Kondo semimetal candidates CeSb and CeBi by quasiparticle interference imaging

ORAL

Abstract

Topological materials are characterized by strong spin-orbit coupling and bulk band inversion, leading to protected surface states with momentum-locked spin or chirality. Meanwhile, Kondo systems often host rich magnetic phase diagrams because of their strong electron correlations. Materials with both strong spin-orbit coupling and strong electron correlations are predicted to host even more intriguing topological properties. Here we use scanning tunneling microscopy (STM) and quasiparticle interference (QPI) to image the band structure of the predicted Weyl-Kondo candidates CeSb and CeBi. We probe the dispersion of Ce p and d bands, and identify two accidental crossings, one below and one above the Fermi level. We search for topological surface states, by imaging their scattering from atomic defects and magnetic domain boundaries.

*STM work was supported by DOE EFRC, Center for the Advancement of Topological Semimetals.
HP was funded by the Gordon and Betty Moore Foundation’s EPiQS Initiative through Grant GBMF4536
Work at Ames Lab was supported by the U.S. DOE, BES, DMSE under Contract No. DE-AC02-07CH11358.
NHJ was funded by the Gordon and Betty Moore Foundation’s EPiQS Initiative through Grant GBMF4411

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Presenters

  • Yu Liu

    • Harvard University
    • Department of Physics, Harvard University

Authors

  • Yu Liu

    • Harvard University
    • Department of Physics, Harvard University

  • Christian Matt

    • Department of Physics, Harvard University
    • Physics Department, Harvard University
    • Physics, Harvard University
    • Department of Physics, Harvard University, Cambridge, MA, United States

  • Harris Pirie

    • Harvard University
    • Physics, Harvard University
    • Department of Physics, Harvard University, Cambridge, MA, United States
    • Department of Physics, Harvard University

  • Nathan Drucker

    • Department of Physics, Harvard University

  • Na Hyun Jo

    • Iowa State University
    • Iowa State University and Ames Laboratory
    • Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA
    • Department of Physics & Astronomy, Iowa State University
    • Department of Physics and Astronomy, Iowa State University
    • Department of physics and astronomy, Iowa State University/Ames Laboratory
    • Physics, Iowa State University/Ames Laboratory

  • Brinda Kuthanazhi

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

  • Sergey L. Bud'ko

    • Iowa State University
    • Ames Laboratory and Iowa State University, Ames, IA, USA
    • Department of Physics & Astronomy, Iowa State University
    • Department of Physics and Astronomy, Iowa State University
    • Department of physics and astronomy, Iowa State University/Ames Laboratory

  • Paul Canfield

    • Ames Laboratory and Dept. of Physics, Iowa State University
    • Ames Laboratory, U.S. DOE, Iowa State University, Ames, Iowa 50011, USA.
    • Ames Laboratory
    • Iowa State University
    • Department of Physics, Iowa State University, Ames Laboratory, Ames, Iowa 50011, USA
    • Ames Laboratory, Iowa State University
    • Ames Laboratory/Iowa State University
    • Iowa State University and Ames Laboratory
    • Ames Laboratory and Iowa State University, Ames, IA, USA
    • Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ.
    • Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA
    • Ames Lab & Dept of Physics and Astronomy, Iowa State University
    • Department of Physics & Astronomy, Iowa State University
    • Department of physics and astronomy, Iowa State University/Ames Laboratory
    • Physics, Iowa State University/Ames Laboratory
    • Ames Laboratory & Iowa State University
    • Physics, Iowa State University

  • Jennifer Hoffman

    • Physics, Harvard University
    • Department of Physics, Harvard University
    • Harvard University
    • Department of Physics, Harvard University, Cambridge, MA, United States