Exciton condensation driving the periodic lattice distortion of 1T-TiSe2

Details Exciton condensation driving the periodic lattice distortion of 1T-TiSe2 Exciton condensation driving the periodic lattice distortion of 1T-TiSe2

2010-12-06

arxiv.org/abs/1012.1119v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures and 1 table

Scientific paper

We address the lattice instability of 1T-TiSe2 in the framework of the exciton condensate phase. We show that, at low temperature, condensed excitons influence the lattice through electron-phonon interaction. It is found that at zero temperature, in the exciton condensate phase of 1T-TiSe2, this exciton condensate exerts a force on the lattice generating ionic displacements comparable in amplitude to what is measured in experiment. This is thus the first quantitative estimation of the amplitude of the periodic lattice distortion observed in 1T-TiSe2 as a consequence of the exciton condensate phase.

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