Volume 74, Number 1, April 2006
|Page(s)||131 - 137|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 March 2006|
Electronic polarons in an extended Falicov-Kimball model
Department of Theoretical Physics, Institute of Advanced Studies The Australian National University, Canberra, ACT 0200, Australia
2 Theoretical Division, Los Alamos National Laboratory - Los Alamos, NM 87545, USA
Accepted: 13 February 2006
We examine the one-dimensional spinless Falicov-Kimball model extended by a hybridization potential between the localized and itinerant electron states. Below half-filling we find a crossover from a mixed-valence metal to an integer-valence phase-separated state with increasing on-site Coulomb repulsion. This crossover regime is characterized by local competition between the strong- and weak-coupling behaviour, manifested by the formation of an electronic polaron liquid. A phase diagram is presented and discussed in detail.
PACS: 71.28.+d – Narrow-band systems; intermediate-valence solids / 71.27.+a – Strongly correlated electrons systems; heavy fermions
© EDP Sciences, 2006
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