Intermediate Coupling Theory of Electronic Ferroelectricity

Details Intermediate Coupling Theory of Electronic Ferroelectricity Intermediate Coupling Theory of Electronic Ferroelectricity

2003-08-18

arxiv.org/abs/cond-mat/0308329v2

Phys. Rev. Lett. 92, 187601 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.92.187601

We calculate the quantum phase diagram of an extended Falicov-Kimball model for one and two-dimensional systems in the intermediate coupling regime. Even though some features of the phase diagram are obtained analytically, the main results are calculated with a constrained path Monte Carlo technique. We find that this regime is dominated by a Bose-Einstein condensation of excitons with a built-in electric polarization. The inclusion of a finite hybridization between the bands removes the condensate but reinforces the ferroelectricity.

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