Evidence for an excitonic insulator phase in 1T-TiSe$_{2}$

Details Evidence for an excitonic insulator phase in 1T-TiSe$_{2}$ Evidence for an excitonic insulator phase in 1T-TiSe$_{2}$

2007-04-02

arxiv.org/abs/0704.0159v1

Physics

Condensed Matter

Strongly Correlated Electrons

Submitted to PRL

Scientific paper

10.1103/PhysRevLett.99.146403

We present a new high-resolution angle-resolved photoemission study of 1\textit{T}-TiSe$_{2}$ in both, its room-temperature, normal phase and its low-temperature, charge-density wave phase. At low temperature the photoemission spectra are strongly modified, with large band renormalisations at high-symmetry points of the Brillouin zone and a very large transfer of spectral weight to backfolded bands. A theoretical calculation of the spectral function for an excitonic insulator phase reproduces the experimental features with very good agreement. This gives strong evidence in favour of the excitonic insulator scenario as a driving force for the charge-density wave transition in 1\textit{T}-TiSe$_{2}$.

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