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Many-body effects on the Rashba-type spin splitting in bulk bismuth tellurohalides
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 $\mathit{GW}$ approximation noticeably modify the spin-orbit-induced spin splitting evaluated within density functional theory. We demonstrate that …