We have investigated the Ti d-electronic states of stoichiometric TiSe2 for k-vectors in the neighborhood of the L-point at temperatures above and below the critical temperature using angle-resolved photoemission. Strong changes observed in the spectra upon lowering the temperature definitely demostrate that the lattice-instability phase transition involves Ti d-electrons as required by an excitonic-insulator mechanism. The hypothesis that TiSe2 at low temperatures is the first and only known example of an exitonic insulator, therefore, remains plausible after this crucial test.
DIRECT EVIDENCE FOR D-BAND INVOLVEMENT IN THE TISE2 PHASE-TRANSITION / N. G., Stoffel; F., Levy; Bertoni, Carlo Maria; G., Margaritondo. - In: SOLID STATE COMMUNICATIONS. - ISSN 0038-1098. - STAMPA. - 41:(1982), pp. 53-56. [10.1016/0038-1098(82)90248-4]
DIRECT EVIDENCE FOR D-BAND INVOLVEMENT IN THE TISE2 PHASE-TRANSITION
BERTONI, Carlo Maria;
1982
Abstract
We have investigated the Ti d-electronic states of stoichiometric TiSe2 for k-vectors in the neighborhood of the L-point at temperatures above and below the critical temperature using angle-resolved photoemission. Strong changes observed in the spectra upon lowering the temperature definitely demostrate that the lattice-instability phase transition involves Ti d-electrons as required by an excitonic-insulator mechanism. The hypothesis that TiSe2 at low temperatures is the first and only known example of an exitonic insulator, therefore, remains plausible after this crucial test.
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