%0 Journal Article %T Many-body effects on the Rashba-type spin splitting in bulk bismuth tellurohalides %A I. P. Rusinov %A I. A. Nechaev %A S. V. Eremeev %A C. Friedrich %A S. Bl¨ągel %A E. V. Chulkov %J Physics %D 2013 %I arXiv %R 10.1103/PhysRevB.87.205103 %X We report on many-body corrections to one-electron energy spectra of bulk bismuth tellurohalides---materials that exhibit a giant Rashba-type spin splitting of the band-gap edge states. We show that the corrections obtained in the one-shot $GW$ approximation noticeably modify the spin-orbit-induced spin splitting evaluated within density functional theory. We demonstrate that taking into account many-body effects is crucial to interpret the available experimental data. %U http://arxiv.org/abs/1303.4987v2