Fragility of Fermi arcs in Dirac semimetals

ORAL

Abstract

We use tunable, vacuum ultraviolet laser-based angle-resolved photoemission spectroscopy and density functional theory calculations to study the electronic properties of Dirac semimetal candidate PtBi2. In addition to bulk electronic states we also find surface states as expected from theory and band calculations. The topological surface states form Fermi pockets rather than double Fermi arcs that were observed in Na3Bi. The surface bands forming the Fermi pockets merge with bulk bands in proximity of the Dirac points projections, as expected. Our data confirms existence of Dirac states in PtBi2 and reveals the fragility of the Fermi arcs in Dirac semimetals. Because the Fermi arcs are not topologically protected in general, they can be deformed into Fermi pockets, as proposed by Kargarian et al.. Our results demonstrate validity of this theory in PtBi2

*Research was supported by the US DOE, Office of Basic Energy Sciences under Contract No. DEAC02-07CH11358; Ames Laboratory's Laboratory-Directed Research and Development (LDRD) funding. Gordon and Betty Moore Foundation EPiQS Initiative (Grant No. GBMF4411); CEM, a NSF MRSEC, under Grant No. DMR-1420451.

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Presenters

  • Yun Wu

    • Iowa State University
    • Physics, Iowa State University/Ames Laboratory

Authors

  • Yun Wu

    • Iowa State University
    • Physics, Iowa State University/Ames Laboratory

  • 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

  • Lin-Lin Wang

    • Ames Laboratory
    • Iowa State University

  • Connor Schmidt

    • Iowa State University

  • Kathryn Neilson

    • Iowa State University

  • Benjamin Schrunk

    • Iowa State University

  • Przemyslaw Swatek

    • Iowa State University

  • Andrew Eaton

    • Iowa State University

  • 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

  • Adam Kaminski

    • Iowa State University
    • Physics, Iowa State University/Ames Laboratory