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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; et al

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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.
Publication Date: 7-Nov-2016
Electronic Publication Date: 7-Nov-2016
Citation: 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. (2016). Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd. Nature Communications, 13315 - 13315. doi:10.1038/ncomms13315
DOI: doi:10.1038/ncomms13315
EISSN: 2041-1723
Type of Material: Journal Article
Journal/Proceeding Title: Nature Communications
Version: Final published version. This is an open access article.

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