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Using high resolution spin- and angle-resolved photoemission spectroscopy, wemap the electronic structure and spin texture of the surface states of thetopological insulator Sb2Te3. In combination with density functionalcalculations (DFT), we directly show that Sb2Te3 exhibits a partially occupied,single spin-Dirac cone around the Fermi energy, which is topologicallyprotected. DFT obtains a spin polarization of the occupied Dirac cone states of80-90%, which is in reasonable agreement with the experimental data aftercareful background subtraction. Furthermore, we observe a strongly spin-orbitsplit surface band at lower energy. This state is found at 0.8eV below theFermi level at the gamma-point, disperses upwards, and disappears at about0.4eV below the Fermi level into two different bulk bands. Along the gamma-Kdirection, the band is located within a spin-orbit gap. According to anargument given by Pendry and Gurman in 1975, such a gap must contain a surfacestate, if it is located away from the high symmetry points of the Brillouinzone. Thus, the novel spin-split state is protected by symmetry, too.

Probing two topological surface bands of Sb2Te3 by spin-polarized photoemission spectroscopy