title: Impact of electron-hole correlations on the 1T-TiSe_{2} electronic structure.
abstract: Several experiments have been performed on 1T-TiSe_{2} in order to identify whether the electronic structure is semimetallic or semiconducting without reaching a consensus. In this Letter, 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-TiSe_{2} is of predominant semiconducting character with some spectral weight crossing the Fermi level.
authors.affiliation: Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland.
authors.forename: G
authors.initials: G
authors.lastname: Monney
authors.affiliation: Department of Physics, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Monney
authors.affiliation: Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland.
authors.forename: B
authors.initials: B
authors.lastname: Hildebrand
authors.affiliation: Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland.
authors.forename: P
authors.initials: P
authors.lastname: Aebi
authors.affiliation: Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland.
authors.forename: H
authors.initials: H
authors.lastname: Beck