Volume 53, Number 4, February 2001
|Page(s)||532 - 538|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 December 2003|
Instability due to long-range Coulomb interaction in a liquid of Feynman polarons
di Fisica, Università di Roma "La Sapienza"Piazzale
A. Moro 2, I-00185 Roma, Italy and
Consejo Nacional de Investigaciones Científicas y Tecnicas,
Centro Atómico Bariloche
and Instituto Balseiro - 8400 S. C. de Bariloche, Argentina
Accepted: 12 December 2000
The interaction Hamiltonian for a dilute classical liquid of polarons à la Feynman in the presence of long-range Coulomb interaction is derived and the dielectric function is computed in mean field. Above a critical concentration the liquid becomes unstable. The onset of the instability is signaled by the softening of a collective optical mode in which all electrons oscillate in phase in their respective self-trapping potential. We associate the instability with a metalization of the system. Optical experiments in slightly doped cuprates and doped nickelates are analyzed within this theory. We discuss why doped cuprates metalize whereas nickelates do not.
PACS: 71.10.-w – Theories and models of many electron systems / 71.38.+i – Polarons and electron-phonon interactions / 78.20.Bh – Optical properties: Theory, models, and numerical simulation
© EDP Sciences, 2001
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