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High field quantum oscillation studies of Dirac electrons in iron-based kagome lattice metals

ORAL

Abstract

The kagome lattice has long been theoretically known to harbor Dirac dispersions together with a dispersionless (flat) band. The relevance of the kagome lattice model in the context of electronic structures has recently been established in a class of binary hexagonal iron stannides, where Dirac dispersions derived from Fe 3d electrons are observed at Brillouin zone corners in photoemission studies [1,2]. Here we report high magnetic field quantum oscillation studies of Dirac electrons in these iron-based kagome metals including ferromagnetic Fe3Sn2 [3] and antiferromagnetic FeSn [2]. In Fe3Sn2 we observe a doublet of quasi-2D bulk Dirac electrons while a single bulk Dirac pocket is identified in FeSn. We further discuss the impact of crystallographic stacking and magnetic order on the Dirac electronic states in Fe3Sn2 and FeSn. References: [1] L. Ye, M. Kang et al., Nature 555 638-642 (2018). [2] M. Kang, L. Ye et al., arXiv/1906.02167, Nat. Mater. (in press). [3] L. Ye et al., Nat. Comm. 10, 4870 (2019).

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Presenters

  • Linda Ye

    Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT, Department of Physics, Massachusetts Institute of Technology, Physics, MIT

Authors

  • Linda Ye

    Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT, Department of Physics, Massachusetts Institute of Technology, Physics, MIT

  • Min Gu Kang

    Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology, Department of Physics, Massachusetts Institute of Technology, Physics, MIT

  • Mun K. Chan

    Los Alamos National Laboratory, Pulse Field Facility, National High Magnetic Field Laboratory, Los Alamos National Laboratory, National High Magnetic Field Laboratory, LANL, University of Minnesota, NHMFL

  • Ross McDonald

    Los Alamos National Laboratory, physics, los alamos national lab, NHMFL-PFF, Los Alamos National Laboratory, Los Alamos Natl. Lab, Los Alamos Natl Lab, National High Magnetic Field Laboratory, LANL

  • David E Graf

    Florida State University, National High Magnetic Field Laboratory, Florida State University, Department of Physics, National High Magnetic Field Laboratory, Florida State University, Florida, USA, National High Magnetic Field Laboratory, National High Magnetic Field Lab, Florida State University, National High Magnetic Field Laboratory and Department of Physics, Florida State University, Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Lab, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory-Florida State University, National High Magnetic Field Laboratory, Tallahassee, FL, NHMFL, Florida State University, NHMFL

  • Abraham L Levitan

    Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology

  • Minyong Han

    Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT

  • David Charles Bell

    School of Engineering and Applied Sciences, Harvard University, Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Harvard University

  • Madhav Prasad Ghimire

    Central Department of Physics, Kirtipur, 44613, Kathmandu, Nepal, Tribhuvan University, IFW Dresden, Central Department of Physics, Tribhuvan University

  • Shiang Fang

    Harvard University, Department of Physics and Astronomy, Rutgers University, Harvard, Department of Physics, Harvard University, Physics, Harvard University

  • Jhih-Shih You

    IFW Dresden

  • Jorge I. Facio

    IFW Dresden

  • Efthimios Kaxiras

    Harvard University, Department of Physics, Harvard University

  • Jeroen Van den Brink

    Leibniz Institute for Solid State and Materials Research, IFW Dresden, D-01171 Dresden, Germany, Leibniz Institute for Solid State and Materials Research, 01069 Dresden, Germany, IFW - Dresden, IFW Dresden, Germany, IFW Dresden

  • Riccardo Comin

    Massachusetts Institute of Technology MIT, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA, Massachusetts Institute of Technology, Department of Physics, Massachusetts Institute of Technology, Physics, MIT

  • Joseph G Checkelsky

    Department of Physics, Massachusetts Institute of Technology, Department of Physics, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT, Physics, MIT