Charge-density-wave phase transition in 1T-TiSe2:: Excitonic insulator versus band-type Jahn-Teller mechanism -: art. no. 235101

The influence of the charge-density-wave phase transition on the electronic structure of 1T-TiSe2 is studied by means of high-resolution angle-resolved photoemission spectroscopy with synchrotron radiation. We find that both the Se 4p-type valence band maximum at Gamma and the Ti 3d-type conduction band minimum at L are lowered upon cooling. Our photoemission results explain the observed anomalies in the transport data and appear to be consistent with the band-type Jahn-Teller mechanism rather than with excitonic electron-hole interaction.