@article{d6d167a0bd9c473890d2fba235d4fb0f,
title = "Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd",
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.",
author = "Madhab Neupane and Nasser Alidoust and Hosen, {M. Mofazzel} and Zhu, {Jian Xin} and Klauss Dimitri and Xu, {Su Yang} and Nagendra Dhakal and Raman Sankar and Ilya Belopolski and Sanchez, {Daniel S.} and Chang, {Tay Rong} and Jeng, {Horng Tay} and Koji Miyamoto and Taichi Okuda and Hsin Lin and Arun Bansil and Dariusz Kaczorowski and Fangcheng Chou and Hasan, {M. Zahid} and Tomasz Durakiewicz",
note = "Funding Information: M.N. is supported by the start-up fund from University of Central Florida and LANL LDRD Program. T.D. was supported by NSF IR/D program. D.K. was supported by the National Science Centre (Poland) under research grant 2015/18/A/ST3/00057. J.-X. Z. is supported by the Center for Integrated Nanotechnologies, a U.S. DOE Office of Basic Energy Sciences user facility, in partnership with the LANL Institutional Computing Program for computational resources. The work at Princeton and synchrotron X-ray-based measurements are supported by the Office of Basic Energy Sciences, US Department of Energy (DOE) grant no. DE-FG-02-40105ER46200. The work at Northeastern University is supported by the DOE, Office of Science, Basic Energy Sciences grant number DE-FG02-07ER46352, and benefited from Northeastern University{\textquoteright}s Advanced Scientific Computation Center (ASCC) and the NERSC supercomputing center through DOE grant number DE-AC02-05CH11231. H.L. acknowledges the Singapore National Research Foundation for the support under NRF award no. NRF-NRFF2013-03. T.R.C. and H.T.J. were supported by the National Science Council, Taiwan. We also thank NCHC, CINC-NTU and NCTS, Taiwan, for technical support. The measurements at HiSOR were performed with the approval of the Proposal Assessing Committee of HSRC (Proposal No. 15-A-66). We thank Sung-Kwan Mo and Makoto Hashimoto for beamline assistance at the LBNL and the SSRL. Publisher Copyright: {\textcopyright} The Author(s) 2016.",
year = "2016",
doi = "10.1038/ncomms13315",
language = "English",
volume = "7",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
}