Phys. Rev. Lett. 89, 166403 (2002) [4 pages]Electronic Ferroelectricity in the Falicov-Kimball ModelSee Also: Erratum Received 1 May 2002; published 30 September 2002 I show that a spontaneous electric polarization exists in the solution of the Falicov-Kimball model by mapping the strong coupling limit of this Hamiltonian into an xxz spin 1/2 model with a magnetic field. In this way, I determine the phase diagram of the strongly interacting model and show the existence of a transition to a mixed-valence regime containing two phases: an orbitally ordered state and a Bose-Einstein condensation of excitons with a built-in electric polarization. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.166403
DOI:
10.1103/PhysRevLett.89.166403
PACS:
71.27.+a, 71.28.+d, 77.80.–e
See AlsoErratum: C. D. Batista, Erratum: Electronic Ferroelectricity in the Falicov-Kimball Model [Phys. Rev. Lett. 89, 166403 (2002)], Phys. Rev. Lett. 90, 199901 (2003). |
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