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Spin-polarized scanning tunneling microscopy and quasiparticle interference imaging of the magnetic Weyl candidate CeBi

ORAL

Abstract

A Weyl semimetal arises when a bulk Dirac point is split into two Weyl nodes by breaking inversion or time-reversal symmetry (TRS). At low T and increasing B-field, the candidate Weyl material CeBi exhibits a cascade of TRS-breaking magnetic phases. Here we focus on the ferrimagnetic and fully-polarized phases of CeBi, where our density functional theory (DFT) calculations predict several Weyl nodes near the Fermi level (EF). We use spin-polarized scanning tunneling microscopy (SP-STM) and spectroscopy to image the surface magnetic order, and quasiparticle interference (QPI) measurements to quantify the band splitting. Strong suppression of the surface spin-polarization at EF, coincident with a Fano line shape in dI/dV, suggests the Bi p states partially Kondo screen the f magnetic moments, and this p-f mixing causes strong Fermi-level band renormalization. The QPI measurements support p band flattening and ~100 meV splitting, suggesting a strongly interacting magnetic Weyl semimetal with robustly spaced nodes.

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Presenters

  • Yu Liu

    Harvard University

Authors

  • Yu Liu

    Harvard University

  • Christian E. Matt

    Harvard University

  • Harris S Pirie

    Harvard University

  • Nathan Drucker

    Harvard University, Applied Physics, Harvard University

  • Robert-Jan Slager

    University of Cambridge, TCM Group, Cavendish Laboratory, University of Cambridge, TCM Group, Cavendish Laboratory/ Department of Physics, University of Cambridge/ Harvard University, Harvard University

  • Na Hyun Jo

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

  • Brinda Kuthanazhi

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

  • Sergey Budko

    Iowa State University/ Ames Laboratory, Ames Laboratory, Physics and Astronomy, Iowa State University/Ames Laboratory, Ames Laboratory/Iowa State University, Ames Lab/Iowa State, Ames Laboratory, Ames, IA, Iowa State University/AmesLab, Department of Physics & Astronomy, Iowa State University/Ames Laboratory

  • Zhao Huang

    Los Alamos National Laboratory, Theoretical Division, Los Alamos National Laboratory

  • Christopher Lane

    LANL, Theoretical Division, Los Alamos National Laboratory, Theoretical Division/Center for Integrated Nanotechnology, Los Alamos National Laboratory, Los Alamos National Laboratory

  • Jian-Xin Zhu

    Los Alamos Natl Lab, Los Alamos National Laboratory, Theoretical Division/Center for Integrated Nanotechnology, Los Alamos National Laboratory, Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Lab, Center for Integrated Nanotechnologies, Los Alamos National Laboratory

  • Paul C Canfield

    Iowa State University/ Ames Laboratory, Ames Laboratory, Ames Laboratory, Iowa State University, Iowa State University, Ames Lab/Iowa State, Ames Laboratory, Ames, IA, Iowa State University/AmesLab, Department of Physics and Astronomy, Iowa State University/Ames Laboratory, Department of Physics & Astronomy, Iowa State University/Ames Laboratory, Ames Laboratory, U.S. Department of Energy, and Department of Physics and Astronomy, Iowa State University, Ames Laboratory/Iowa State University

  • Jenny E. Hoffman

    Harvard University, Department of Physics, Harvard University