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Title: Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd
Authors: Neupane, M
Alidoust, N
Hosen, M.M
Zhu, J.-X
Dimitri, K
Xu, S.-Y
Dhakal, N
Sankar, R
Belopolski, I
Sanchez, D.S
Chang, T.-R
Jeng, H.-T
Miyamoto, K
Okuda, T
Lin, H 
Bansil, A 
Kaczorowski, D
Chou, F
Hasan, M.Z
Durakiewicz, T
Keywords: bismuth
experimental study
measurement method
observational method
temperature effect
angle resolved photoemission spectroscopy
crystal structure
observational study
temperature dependence
Issue Date: 2016
Publisher: Nature Publishing Group
Citation: Neupane, M, Alidoust, N, Hosen, M.M, Zhu, J.-X, Dimitri, K, Xu, S.-Y, Dhakal, N, Sankar, R, Belopolski, I, Sanchez, D.S, Chang, T.-R, Jeng, H.-T, Miyamoto, K, Okuda, T, Lin, H, Bansil, A, Kaczorowski, D, Chou, F, Hasan, M.Z, Durakiewicz, T (2016). Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd. Nature Communications 7 : 13315. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
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. © The Author(s) 2016.
Source Title: Nature Communications
ISSN: 2041-1723
DOI: 10.1038/ncomms13315
Rights: Attribution 4.0 International
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