Spontaneous exciton condensation in 1T-TiSe2: a BCS-like approach

Abstract

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

Submitted to PRB, 11 pages, 7 figures

References in corpus (3)

• Evidence for an excitonic insulator phase in 1T-TiSe${}_2$
• On the possibility of an excitonic insulator at the semiconductor-semimetal transition
• Electronic structure of copper intercalated transition metal dichalcogenides: First-principles calculations

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