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arXiv · 1610.03431

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·Tomasz Durakiewicz
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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 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.

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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, Tomasz Durakiewicz. 2016-10-11. Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd. https://doi.org/10.1038/ncomms13315

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