Dirac State in a Centrosymmetric Superconductor α-PdBi2

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.

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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