DORA PSI (Paul Scherrer Institute) · 2008 · 81 citations · 0 references
Natural SciencesPhysicsCondensed Matter PhysicsSolid State PhysicsSpectroscopyAb Initio MethodsDensity Functional TheoryElectronic Band StructureElectronic Excited StatesLow-dimensional SolidsPhase TransitionsAngle-resolved Photoelectron SpectroscopyAngle-resolved Photoemission SpectroscopyAnisotropic Band StructureExciton PhysicsExciton StatesExcitonic MaterialsExcitonsExcitons In Low-dimensional Systems
Recently strong evidence has been found in favor of a BCS-like condensation of excitons in 1\textit{T}-TiSe$_2$. Theoretical photoemission intensity maps have been generated by the spectral function calculated within the excitonic condensate phase model and set against experimental angle-resolved photoemission spectroscopy data. Here, the calculations in the framework of this model are presented in detail. They represent an extension of the original excitonic insulator phase model of Jérome \textit{et al.} [Phys. Rev. {\bf 158}, 462 (1967)] to three dimensional and anisotropic band dispersions. A detailed analysis of its properties and further comparison with experiment are also discussed