Topological insulators have attracted much interest recently from Condensed Matter Physics as well as the wider scientific community. They are characterized by having bulk electronic states like that of a standard band gap insulator but with spin-momentum locked conduction channels only at the surface of the material. This spin-polarized surface conduction channel opens up a wide range of exciting technological applications in the future including spintronics and quantum computation. For a well-written review of topological insulators so far please try (M. Z. Hasan , C. L. Kane Rev. Mod. Phys. (82), 3045-3067).