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We report high-resolution spin-resolved photoemission spectroscopy(Spin-ARPES) measurements on the parent compound Sb of the first discovered 3Dtopological insulator Bi{1-x}Sb{x} [D. Hsieh et al., Nature 452, 970 (2008)Submitted 2007]. By modulating the incident photon energy, we are able to mapboth the bulk and (111) surface band structure, from which we directlydemonstrate that the surface bands are spin polarized by the spin-orbitinteraction and connect the bulk valence and conduction bands in atopologically non-trivial way. A unique asymmetric Dirac surface state givesrise to a $k$-splitting of its spin polarized electronic channels. Theseresults complement our previously published works on this materials class andre-confirm our discovery of first bulk (3D) topological insulator - topologicalorder in bulk solids. [Invited article for NJP-IOP Focus issue on "TopologicalInsulators"]

Direct observation of spin-polarized surface states in the parent  compound of topological insulator Bi-Sb using spin-resolved-ARPES in a 3D  Mott-polarimetry spin mode