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We show that the strongly spin-orbit coupled materials Bi2Te3 and Sb2Te3(first non-Bi topological insulator) and their derivatives belong to the Z2(Time-Reversal-Protected, elastic backscattering suppressed)topological-insulator class. Using a combination of first-principlestheoretical calculations and photoemission spectroscopy, we directly show thatBi2Te3 is a large spin-orbit-induced indirect bulk band gap (about 150 meV)semiconductor whose surface is characterized by a single topological spin-Diraccone. The electronic structure of self-doped Sb2Te3 exhibits similar Z2topological properties. We demonstrate that the dynamics of surface spin-onlyDirac fermions can be controlled through systematic Mn doping, making thesematerials classes potentially suitable for exploring novel topological physics.We emphasize (theoretically and experimentally) that the Dirac node is wellwithin the bulk-gap and not degenerate with the bulk valence band.

Time-reversal-protected single-Dirac-cone topological-insulator states  in Bi2Te3 and Sb2Te3: Topologically Spin-polarized Dirac fermions with pi  Berry's Phase