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

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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