Competing chiral and multipolar electric phases in the extended Falicov-Kimball model

Details Competing chiral and multipolar electric phases in the extended Falicov-Kimball model Competing chiral and multipolar electric phases in the extended Falicov-Kimball model

2010-10-11

arxiv.org/abs/1010.2040v1

Phys. Rev. B 82, 165110 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 2 figures

Scientific paper

We study the effects of interband hybridization within the framework of an extended Falicov-Kimball model with itinerant $c$ and $f$ electrons. An explicit interband hybridization breaks the U(1) symmetry associated with the conservation of the difference between the total number of particles in each band. As a result, the degeneracy between multipolar electric and chiral orderings is lifted. We analyze the weak- and strong-coupling limits of the $c$-$f$ electron Coulomb interaction at zero temperature, and derive the corresponding mean-field quantum phase diagrams at half-filling for a model defined on a square lattice.

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