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TT: Fachverband Tiefe Temperaturen
TT 9: CE: (General) Theory 1
TT 9.15: Vortrag
Montag, 14. März 2011, 18:00–18:15, HSZ 201
Competing chiral and multipolar electric phases in the extended Falicov-Kimball model — •Bernd Zenker1, Holger Fehske1, and Cristian Daniel Batista2 — 1Ernst-Moritz-Arndt Universität Greifswald, Greifswald, Germany — 2Los Alamos National Laboratory, Los Alamos, USA
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.