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We investigate the bulk band structures and the surface states of Bi2Se3 andBi2Te3 topological insulators using first-principles many-body perturbationtheory based on the GW approximation. The quasiparticle self-energy correctionsintroduce significant changes to the bulk band structures, while their effecton the band gaps is opposite in the band-inversion regime compared to the usualsituation without band inversion. Parametrized "scissors operators" derivedfrom the bulk studies are then used to investigate the electronic structure ofslab models which exhibit topologically protected surface states. The resultsincluding self-energy corrections reveal significant shifts of the Dirac pointsrelative to the bulk bands and large gap openings resulting from theinteractions between the surface states across the thin slab, both in agreementwith experimental data.

Quasiparticle Effects in the Bulk and Surface-State Bands of Bi2Se3 and Bi2Te3 Topological Insulators