Dirac State in a Centrosymmetric Superconductor α-PdBi<sub>2</sub>

ORAL

Abstract

Topological superconductor (TSC) hosting Majorana fermions has been established as a milestone that may shift our scientific trajectory from research to applications in topological quantum computing. Recently, superconducting Pd-Bi binaries have attracted great attention as a possible medium for TSC phase as a result of their large spin-orbit coupling strength. Here, we report a systematic high-resolution angle-resolved photoemission spectroscopy (ARPES) study on the normal state electronic structure of superconducting α -PdBi2 (Tc = 1.7 K). Our results show the presence of Dirac states at higher-binding energy with the location of the Dirac point at 1.26 eV below the chemical potential at the zone center. Furthermore, the ARPES data indicate multiple band crossings at the chemical potential, consistent with a metallic behavior of α -PdBi2. Our detailed experimental studies are complemented by first-principles calculations, which reveal the presence of surface Rashba states residing in the vicinity of the chemical potential.

*This work was supported by the Air Force Office of Scientific Research under Award Number FA9550-17-1-0415 and the startup fund from UCF (MN).

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Presenters

  • Klauss Dimitri

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

Authors

  • Klauss Dimitri

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

  • 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

  • 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

  • Tomasz Durakiewicz

    • National Science Foundation
    • 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

  • 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