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Topological superconductor (TSC) hosting Majorana fermions has beenestablished as a milestone that may shift our scientific trajectory fromresearch to applications in topological quantum computing. Recently,superconducting Pd-Bi binaries have attracted great attention as a possiblemedium for the TSC phase as a result of their large spin-orbit couplingstrength. Here, we report a systematic high-resolution angle-resolvedphotoemission spectroscopy (ARPES) study on the normal state electronicstructure of superconducting alpha-PdBi2 (Tc = 1.7 K). Our results show thepresence of Dirac states at higher-binding energy with the location of theDirac point at 1.26 eV below the chemical potential at the zone center.Furthermore, the ARPES data indicate multiple band crossings at the chemicalpotential, consistent with the metallic behavior of alpha-PdBi2. Our detailedexperimental studies are complemented by first-principles calculations, whichreveal the presence of surface Rashba states residing in the vicinity of thechemical potential. The obtained results provide an opportunity to investigatethe relationship between superconductivity and topology, as well as explorepathways to possible future platforms for topological quantum computing.

Dirac State in a Centrosymmetric Superconductor alpha-PdBi2