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

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 Jeng, Koji Miyamoto, Taichi Okuda, Hsin Lin, Arun Bansil, Dariusz Kaczorowski, Fangcheng Chou, M. Zahid Hasan and Tomasz Durakiewicz
Additional contact information
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
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
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

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms13315

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