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 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.

arXiv comment30 pages, 12 figures, Expanded version of arXiv:1505.03466, To appear in Nature Communications

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• Dirac State in a Centrosymmetric Superconductor alpha-PdBi2
• Prediction of Nontrivial Band Topology and Superconductivity in Mg${}_2$Pb
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• Full superconducting gap and type-I to type-II superconductivity transition in single crystalline NbGe2
• Spin-Orbital Hallmarks of Unconventional Superconductors Without Inversion Symmetry
• Unconventional pressure dependence of the superfluid density in the nodeless topological superconductor $\alpha$-PdBi${}_2$
• Correct Brillouin zone and electronic structure of BiPd
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• Experimental detection of topological electronic state and large linear magnetoresistance in $SrS{n}_4$ superconductor
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• Photoemission Spectroscopic Evidence of Multiple Dirac Cones in Superconducting BaSn${}_3$
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• Probing the superconducting pairing of the La${}_4$Be${}_{33}$Pt${}_{16}$ alloy via muon-spin spectroscopy
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• Evolution of Magnetoresistance in the magnetic topological semimetals NdSbxTe2-x
• Temperature dependence of the lower critical field of the noncentrosymmetric superconductor $\alpha$-BiPd
• Discovery of magnetic topological crystals
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• Conventional superconductivity in single-crystalline BiPt
• Anomalous spectral evolution with bulk sensitivity in BiPd