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 behavior 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.
@article{arxiv.1610.03431,
title = {Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd},
author = {Madhab Neupane and Nasser Alidoust and M. Mofazzel Hosen and Jian-Xin Zhu and Klauss Dimitri and Su-Yang Xu and Nagendra Dhakal and Raman Sankar and Ilya Belopolski and Daniel S. Sanchez and Tay-Rong Chang and Horng-Tay Jeng and Koji Miyamoto and Taichi Okuda and Hsin Lin and Arun Bansil and Dariusz Kaczorowski and Fangcheng Chou and M. Zahid Hasan and Tomasz Durakiewicz},
journal= {arXiv preprint arXiv:1610.03431},
year = {2017}
}
Comments
30 pages, 12 figures, Expanded version of arXiv:1505.03466, To appear in Nature Communications