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Several experiments have been performed on 1T-TiSe2 in order to identifywhether the electronic structure is semimetallic or semiconducting withoutreaching a consensus. In this paper, we theoretically study the impact ofelectron-hole and electron-phonon correlations on the bare semimetallic andsemiconducting electronic structure. The resulting electron spectral functionsprovide a direct comparison of both cases and demonstrate that 1T-TiSe2 is ofpredominant semiconducting character with some spectral weight crossing theFermi level.

Impact of Electron-Hole Correlations on the 1T-TiSe2 Electronic Structure