Observation of Dirac States in Superconducting Materials

POSTER

Abstract

The massive shift in interest towards Topological Superconductors (TSC) and their potential to host Majorana fermions has been a major point that connects the rhetoric of both quantum computation and topological materials. Following this narrative, superconducting Pd-Bi binaries have large spin orbit coupling strength and can develop a TSC phase peaking the interests of both fields. Here, we report a 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 Dirac point 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 the metallic behavior of α−PdBi2. Our experimental studies are complemented by first-principles calculations, revealing the presence of surface Rashba states in the vicinity of the chemical potential. Our study extends to other superconducting materials providing an opportunity to investigate the relationship between superconductivity and topology.

*This work is supported by the Air Force Office of Scientific Research under Award No. FA9550-17-1-0415 and the startup fund from UCF (M.N.).

Presenters

  • Klauss Dimitri

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

Authors

  • Klauss Dimitri

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

  • Md Mofazzel Hosen

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

  • Gyanendra Dhakal

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

  • Hongchul Choi

    • Theoretical Division, Los Alamos National Laboratory
    • Scuola Internazionale Superiore di Studi Avanzati

  • Firoza Kabir

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

  • Christopher Sims

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA

  • Dariusz Kaczorowski

    • Polish Academy of Sciences
    • Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-950 Wroclaw, Poland
    • Institute of Low Temperature and Structure Research, Polish Academy of Sciences
    • Polish Academy of Science

  • Tomasz Durakiewicz

    • National Science Foundation
    • Los Alamos National Laboratory

  • Jian-Xin Zhu

    • Theoretical Division, Los Alamos National Laboratory
    • Los Alamos National Laboratory
    • Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Laboratory
    • T4-PHYS OF CONDENSED MATTER & COMPLEX SYS, Los Alamos National Laboratory, Los aAlamos, USA
    • CINT, Los Alamos National Laboratory
    • Center for Integrated Nanotechnologies, Los Alamos National Laboratory
    • Los Alamos National Laboratory,

  • Madhab Neupane

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida