  Several experiments have been performed on 1T-TiSe2 in order to identify
whether the electronic structure is semimetallic or semiconducting without
reaching a consensus. In this paper, we theoretically study the impact of
electron-hole and electron-phonon correlations on the bare semimetallic and
semiconducting electronic structure. The resulting electron spectral functions
provide a direct comparison of both cases and demonstrate that 1T-TiSe2 is of
predominant semiconducting character with some spectral weight crossing the
Fermi level.
