Temperature dependent photoemission on 1T-TiSe2: Interpretation within the exciton condensate phase model

Details Temperature dependent photoemission on 1T-TiSe2: Interpretation within the exciton condensate phase model Temperature dependent photoemission on 1T-TiSe2: Interpretation within the exciton condensate phase model

2009-11-02

arxiv.org/abs/0911.0327v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 6 figures

Scientific paper

The charge density wave phase transition of 1T-TiSe2 is studied by angle-resolved photoemission over a wide temperature range. An important chemical potential shift which strongly evolves with temperature is evidenced. In the framework of the exciton condensate phase, the detailed temperature dependence of the associated order parameter is extracted. Having a mean-field-like behaviour at low temperature, it exhibits a non-zero value above the transition, interpreted as the signature of strong excitonic fluctuations, reminiscent of the pseudo-gap phase of high temperature superconductors. Integrated intensity around the Fermi level is found to display a trend similar to the measured resistivity and is discussed within the model.

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