Weak-coupling treatment of electronic (anti-)ferroelectricity in the extended Falicov-Kimball model |
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Authors: | C Schneider G Czycholl |
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Institution: | (1) Institute for Theoretical Physics, University of Bremen, 28334 Bremen, Germany |
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Abstract: | We study the (spinless) Falicov-Kimball model extended by a finite band width (hopping t
f
) of the localized (f-) electrons in infinite dimensions in the weak-coupling limit of a small local interband Coulomb correlation U for half filling. In the case of overlapping conduction- and f-bands different kinds of ordered solutions are possible, namely charge-density wave (CDW) order, electronic ferroelectricity
(EFE) and electronic antiferroelectricity (EAFE). The order parameters are calculated as a function of the model parameters
and of the temperature. There is a first-order phase transition from the CDW-phase to the EFE- or EAFE-phase. The total energy
is calculated to determine the thermodynamically stable solution. The quantum phase diagrams are calculated. |
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Keywords: | PACS" target="_blank">PACS 71 30 +h Metal-insulator transitions and other electronic transitions 71 28 +d Narrow-band systems intermediate-valence solids 71 27 +a Strongly correlated electron systems heavy fermions |
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