Observation of a Dirac state in a half-Heusler material YPtBi

POSTER

Abstract

The prediction of non-trivial topological electronic states hosted by half-Heusler compounds makes them prime candidates for discovering new physics and devices as they harbor a variety of electronic ground states including superconductivity, magnetism, and heavy fermion behavior. Here we report a systematic study of normal state electronic properties of the superconducting half-Heusler compound YPtBi using angle-resolved photoemission spectroscopy (ARPES). Our data reveal the presence of a Dirac state at the Γ point of the Brillouin zone at 500 meV below the chemical potential. We observe the presence of multiple Fermi surface pockets including two concentric hexagonal and six half oval-shaped pockets at the Γ and K points of the Brillouin zone, respectively. Furthermore, our measurements show Rashba-split bands and multiple surface states crossing the chemical potential which are supported by the first-principles calculations. Our findings of a Dirac state in YPtBi play a significant role in establishing half-Heusler compounds as a new potential platform for novel topological phases and explore their connection with superconductivity.

Presenters

  • Christopher Sims

    Department of Physics, University of Central Florida

Authors

  • Christopher Sims

    Department of Physics, University of Central Florida

  • Md Mofazzel Hosen

    Department of Physics, University of Central Florida, University of central florida, Department of Physics, Univ of Central Florida

  • Gyanendra Dhakal

    Department of Physics, University of Central Florida, University of central florida, Department of Physics, Univ of Central Florida

  • Klauss Dimitri

    Department of Physics, University of Central Florida, University of central florida, Department of Physics, Univ of Central Florida

  • Hongchul Choi

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

  • Firoza Kabir

    Department of Physics, University of Central Florida, University of central florida, Department of Physics, Univ of Central Florida

  • Orest pavlosiuk

    Institute of Low Temperature and Structure Research, Polish Academy of Sciences

  • Piotr Wisniewski

    Institute of Low Temperature and Structure Research, Polish Academy of Sciences

  • Tomasz Durakiewicz

    Condensed Matter and Magnet Science Group, Los Alamos National Laboratory, Los Alamos National Laboratory, Condensed Matter and Magnet Science Group,, Los Alamos National Laboratory

  • Jian-Xin Zhu

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

  • Dariusz Kaczorowski

    Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Institute of Low Temperature and Structure Research, Polish Academy of Science, Institute of Low Temperature and Structure Research

  • Madhab Neupane

    Department of Physics, University of Central Florida, University of central florida, Department of Physics, Univ of Central Florida, Univ of Central Florida, University of Central Florida, Department of Physics , Univ of Central Florida