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Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd

Author

Listed:
  • Madhab Neupane

    (University of Central Florida)

  • Nasser Alidoust

    (Princeton University)

  • M. Mofazzel Hosen

    (University of Central Florida)

  • Jian-Xin Zhu

    (Los Alamos National Laboratory)

  • Klauss Dimitri

    (University of Central Florida)

  • Su-Yang Xu

    (Princeton University)

  • Nagendra Dhakal

    (University of Central Florida)

  • Raman Sankar

    (Center for Condensed Matter Sciences, National Taiwan University)

  • Ilya Belopolski

    (Princeton University)

  • Daniel S. Sanchez

    (Princeton University)

  • Tay-Rong Chang

    (National Tsing Hua University)

  • Horng-Tay Jeng

    (National Tsing Hua University
    Institute of Physics)

  • Koji Miyamoto

    (Hiroshima Synchrotron Radiation Center, Hiroshima University)

  • Taichi Okuda

    (Hiroshima Synchrotron Radiation Center, Hiroshima University)

  • Hsin Lin

    (Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
    National University of Singapore)

  • Arun Bansil

    (Northeastern University)

  • Dariusz Kaczorowski

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

  • Fangcheng Chou

    (Center for Condensed Matter Sciences, National Taiwan University)

  • M. Zahid Hasan

    (Princeton University)

  • Tomasz Durakiewicz

    (Condensed Matter and Magnet Science Group, Los Alamos National Laboratory
    Institute of Physics, Maria Curie - Sklodowska University)

Abstract

Recently, noncentrosymmetric superconductor BiPd has attracted considerable research interest due to the possibility of hosting topological superconductivity. Here we report a systematic high-resolution angle-resolved photoemission spectroscopy (ARPES) and spin-resolved ARPES study of the normal state electronic and spin properties of BiPd. Our experimental results show the presence of a surface state at higher-binding energy with the location of Dirac point at around 700 meV below the Fermi level. The detailed photon energy, temperature-dependent and spin-resolved ARPES measurements complemented by our first-principles calculations demonstrate the existence of the spin-polarized surface states at high-binding energy. The absence of such spin-polarized surface states near the Fermi level negates the possibility of a topological superconducting behaviour on the surface. Our direct experimental observation of spin-polarized surface states in BiPd provides critical information that will guide the future search for topological superconductivity in noncentrosymmetric materials.

Suggested Citation

  • Madhab Neupane & Nasser Alidoust & M. Mofazzel Hosen & Jian-Xin Zhu & Klauss Dimitri & Su-Yang Xu & Nagendra Dhakal & Raman Sankar & Ilya Belopolski & Daniel S. Sanchez & Tay-Rong Chang & Horng-Tay Je, 2016. "Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd," Nature Communications, Nature, vol. 7(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13315
    DOI: 10.1038/ncomms13315
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