Spontaneous exciton condensation in 1T-TiSe2: BCS-like approach
作者： C. Monney , H. Cercellier , F. Clerc , C. Battaglia , E. F. Schwier
DOI: 10.1103/PHYSREVB.79.045116
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摘要: Recently we found strong evidence in favor of a BCS-like condensation excitons 1T-TiSe2 [Cercellier , Phys. Rev. Lett. 99, 146403 (2007)]. Theoretical photoemission intensity maps have been generated by the spectral function calculated within exciton condensate phase model and set against experimental angle-resolved spectroscopy data. The scope this paper is to present detailed calculations framework model. They represent an extension original excitonic insulator Jerome [Phys. 158, 462 (1967)] three dimensional anisotropic band dispersions. A analysis its properties comparison with experiment presented. Finally, disagreement density-functional theory discussed.
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