Surface state of the dual topological insulator Bi(0.9)1Sb(0.09)(11(2)over-bar)

The electronic structure of a Bi(0.9)1Sb(0.09) single crystal was elucidated at a bisectrix (11 (2) over bar) surface by angle-resolved photoemission spectroscopy using microbeam synchrotron radiation. A Dirac-cone-like dispersion of the surface state was observed at the G (Gamma) over bar point. The detected surface-state band likely corresponds to the one observed in previous quantum transport research (Taskin and Ando, 2009) [14].