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

  • Author(s): Neupane, Madhab;
  • Alidoust, Nasser;
  • Hosen, M Mofazzel;
  • Zhu, Jian-Xin;
  • Dimitri, Klauss;
  • Xu, Su-Yang;
  • Dhakal, Nagendra;
  • Sankar, Raman;
  • Belopolski, Ilya;
  • Sanchez, Daniel S;
  • Chang, Tay-Rong;
  • Jeng, Horng-Tay;
  • Miyamoto, Koji;
  • Okuda, Taichi;
  • Lin, Hsin;
  • Bansil, Arun;
  • Kaczorowski, Dariusz;
  • Chou, Fangcheng;
  • Hasan, M Zahid;
  • Durakiewicz, Tomasz
  • et al.
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.

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